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proportionality
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in mathematics, two variables are proportional if a change in one is always accompanied by a change in the other, and if the changes are always related by use of a constant
Proportionality means that when one thing changes, another thing changes in a predictable way—always by the same ratio or constant. This matters because it lets us predict how one thing will behave based on changes in another, which is useful for everything from cooking recipes to understanding how speed and distance relate to each other.
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The variable y is directly proportional to the variable x with proportionality constant ~0.6. The variable y is inversely proportional to the variable x with proportionality constant 1.
In mathematics, two sequences of numbers, often experimental data, are proportional or directly proportional if their corresponding elements have a constant ratio. The ratio is called coefficient of proportionality (or proportionality constant) and its reciprocal is known as constant of normalization (or normalizing constant). Two sequences are inversely proportional if corresponding elements have a constant product.