At the request of the **math**, the **proportionality **is the **conformity or proportion (equality of two reasons) of some parts with the whole or of elements linked to each other **, or more formally, it turns out to be the **relationship between measurable quantities**.

Meanwhile, as a mathematical concept, it stands out from many others for being one of the most widespread, that is, almost everyone knows its scope and uses it in their daily lives.

Meanwhile, the mathematical symbol that by convention is used to indicate those values that turn out to be proportional is:** ∝.**

A proportion is made up of a, b, c and d, while, if the ratio between a and b is the same as between c and d, a proportion is made up of two ratios equal to: b = c: d, where a, b, c and d are different from 0 and will be read as follows: a is ab, as c is a d.

It should be noted that when one ratio equals another, in effect, there is proportionality, that is, to have a proportional relationship we need to have two ratios that are equivalent.

There are two types of proportionality, one **reverse and other direct**However, both serve to solve those problems where one reason is known and only one piece of information about the second.

Then, two quantities will be directly proportional if when one of them increases, by double, triple or quadruple, the quantities that correspond to the other also increase by the same quantities, that is, double, triple, quadruple. .

And on the contrary, two magnitudes are inversely proportional when when one increases, the other decreases in the same proportion.