File:Proportional_variables.svg · Wikimedia Commons · See Wikimedia Commons
Also known as linearity, proportional to
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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Article · 日本語
比例（ひれい、英: proportionality）とは、変数を用いて書かれる二つの量に対し一方が他方の定数倍であるような関係のことである。
Abstract from DBpedia / Wikipedia · CC BY-SA