High Quality Content by WIKIPEDIA articles! This article is about proportionality, the mathematical relation. For other uses of the term proportionality, see Proportionality disambiguation. y is directly proportional to x. In mathematics, two quantities are said to be proportional if they vary in such a way that one of the quantities is a constant multiple of the other, or equivalently if they have a constant ratio. Proportion also refers to the equality of two ratios.

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