*For the math equations, see: Proportions*.

A **proportion** (adjective: **proportionate**) is a relationship between two quantities or numbers. A proportion can be expressed as a word, for example, one man may be described as *smaller* than another man. A proportion can usually be expressed more precisely by *numbers*. For example, the proportion, or mathematical relationship, between one man and two men can be written as the numbers "1/2", which is also known as a fraction or ratio.

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Proportionality Facts for Kids. *Kiddle Encyclopedia.*