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'''Proportion''' in mathematics exists when two quantities 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.

'''Proportion''' in mathematics exists when two quantities 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.

==Symbol==

==Symbol==

The mathematical [[symbol]] '∝' is used to indicate that two [[values]] are proportional. For example, A ∝ B.

The mathematical [[symbol]] '∝' is used to indicate that two [[values]] are proportional. For example, A ∝ B.

==Direct proportionality==

==Direct proportionality==

Given two variables x and y, y is (directly) proportional to x (x and y vary directly, or x and y are in direct variation) if there is a non-zero constant k such that

Given two variables x and y, y is (directly) proportional to x (x and y vary directly, or x and y are in direct variation) if there is a non-zero constant k such that