- the relation between two similar magnitudes with respect to the number of times the first contains the second: the ratio of 5 to 2, written 5:2 or 5/2.
- proportional relation; rate: the ratio between acceptances and rejections.
- Finance. the relative value of gold and silver in a bimetallic currency system.
Origin of ratio
ultima ratio regum
- the final argument of kings (a resort to arms): motto engraved on the cannon of Louis XIV.
Examples from the Web for ratio
During an emergency that ratio could be allowed to drop to 8.5 people per orbit.
However, the Air Force is so strapped for people that the ratio has dropped below even that reduced level.
From that, they extracted the ratio of the number of deuterium atoms to the number of hydrogen atoms.Are Comets the Origin of Earth’s Oceans?
Matthew R. Francis
December 14, 2014
Two years ago, Asian American voters voted for Obama over Romney by a ratio of more than 3-to-1.Asian Americans Are The Country’s Fastest Growing Swing Vote
November 9, 2014
The beauty of the project comes from the ratio of professional artists, recreational artists, and just creative people.Blurred Lines at NY Sketchbook Museum
November 1, 2014
This ratio is phenomenally large, and should not be taken as a guide by amateurs.
But few of us understand just what the ratio of increase is, or how it is caused.
Just what the ratio of the curve should be is a matter of contention.
Take any ratio of percentage you please and something should have got us.The Rock of Chickamauga
Joseph A. Altsheler
Business will increase largely, and the ratio of expenses will decrease.The Railroad Question
- a measure of the relative size of two classes expressible as a proportionthe ratio of boys to girls is 2 to 1
- maths a quotient of two numbers or quantitiesSee also proportion (def. 6)
Word Origin and History for ratio
1630s, "reason, rationale," from Latin ratio "reckoning, numbering, calculation; business affair, procedure," also "reason, reasoning, judgment, understanding," from rat-, past participle stem of reri "to reckon, calculate," also "think" (see reason (n.)). Mathematical sense "relationship between two numbers" is attested from 1650s.
- Relation in degree or number between two similar things.
- The relation between two quantities expressed as the quotient of one divided by the other.
- A relationship between two quantities, normally expressed as the quotient of one divided by the other. For example, if a box contains six red marbles and four blue marbles, the ratio of red marbles to blue marbles is 6 to 4, also written 6:4. A ratio can also be expressed as a decimal or percentage.
An expression of the relative size of two numbers by showing one divided by the other.