In mathematics, a **ratio** is a relationship between two numbers of the same kind (*e.g.*, objects, persons, students, spoonfuls, units of whatever identical dimension), usually expressed as *"a* to *b"* or a:b, sometimes expressed arithmetically as a dimensionless quotient of the two that explicitly indicates how many times the first number contains the second (not necessarily an integer).

In layman's terms a ratio represents, simply, for every amount of one thing, how much there is of another thing. For example, supposing one has 8 oranges and 6 lemons in a bowl of fruit, the ratio of oranges to lemons would be 4:3 (which is equivalent to 8:6) and the ratio of lemons to oranges would be would be 3:4. Additionally, the ratio of oranges to the total amount of fruit is 4:7 (equivalent to 8:14). The 4:7 ratio can be further converted to a fraction of 4/7 to represent how much of the fruit is an orange.

Read more about Ratio: Notation and Terminology, History and Etymology, Examples, Number of Terms, Proportions, Reduction, Odds, Different Units

### Other articles related to "ratio, ratios":

**Ratio**

... The thrust-to-weight

**ratio**can be calculated by dividing the thrust (in SI units – in newtons) by the weight (in newtons) of the engine or vehicle ... valid comparison of the initial thrust-to-weight

**ratio**of two or more engines or vehicles, thrust must be measured under controlled conditions ...

**Ratio**- Different Units

...

**Ratios**are unitless when they relate quantities in units of the same dimension ... For example, the

**ratio**1 minute 40 seconds can be reduced by changing the first value to 60 seconds ... Once the units are the same, they can be omitted, and the

**ratio**can be reduced to 32 ...

... and is most often measured in an 187Os/188Os

**ratio**... This

**ratio**, as well as the 187Re/187Os

**ratio**, have been used extensively in dating terrestrial as well as meteoric rocks ...

**Ratio**Cycle

... Oxygen isotope

**ratio**cycles are cyclical variations in the

**ratio**of the abundance of oxygen with an atomic mass of 18 to the abundance of oxygen with an atomic mass of 16 present ... The

**ratio**is linked to water temperature of ancient oceans, which in turn reflects ancient climates ... Cycles in the

**ratio**mirror climate changes in geologic history ...

**Ratio**

... The term bypass

**ratio**(BPR) relates to the design of turbofan engines, commonly used in aviation ... It is defined as the

**ratio**between the mass flow rate of air drawn through a fan disk which bypasses the engine core (un-combusted air), to the mass flow rate passing through the ... For example, with a 101 bypass

**ratio**, for every 1 kg of air passing through the combustion chamber, 10 kg of air passes around the combustion chamber through the ducted fan alone ...

### Famous quotes containing the word ratio:

“Official dignity tends to increase in inverse *ratio* to the importance of the country in which the office is held.”

—Aldous Huxley (1894–1963)

“People are lucky and unlucky not according to what they get absolutely, but according to the *ratio* between what they get and what they have been led to expect.”

—Samuel Butler (1835–1902)

“A magazine or a newspaper is a shop. Each is an experiment and represents a new focus, a new *ratio* between commerce and intellect.”

—John Jay Chapman (1862–1933)