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(mathematics) At a constant ratio (to). Two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first. Symbol: ∝.
2012, David Ben-Chaim, Ratio and Proportion, page 34:
For example, according to the gas laws, pressure is directly proportional to temperature: the quotient derived from pressure (numerator) and temperature (denominator) will be constant; however, pressure is inversely proportional to volume, meaning that the product between volume and pressure will be constant.
1) When an adjective is applied predicatively to something definite, the corresponding "indefinite" form is used. 2) The "indefinite" superlatives may not be used attributively.