# Proportions Calculator

## Why would someone need to use the proportions formula?

**Proportion Calculator** (sometimes called rule of three) is a **Mathematical Rule** used to solve problems based on proportions

You need two numbers that are proportional to one another and then a third to calculate the missing fourth number

### Proportions calculator examples

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#### How do I apply rule of three?

let a = 10;

let b = 50;

let c = 100;

let divideBy = b * c;

let result = divideBy / a

console.log(result);

$a = 10;

$b = 50;

$c = 100;

$result = ($b * $c) / $a;

## What is the proportions formula?

**Formula: X = (B * C) / A**Lets do a simple example.

**If 10 is 100 then 100 is?**

- Apply the formula
**(B * C) / A** - Replace with our values ->
**(100 * 50) / 10** - Solve parentheses first ->
**100 * 50 = 5000** - Then do the math for ->
**5000 / 10 = 500** **Answer is 500**

### What is a Mathematical Formula?

A mathematical formula is a way to represent a mathematical expression by using symbols called "formula elements" that are arranged according to a set of rules. The term "mathematical formula" is used in two ways: In mathematics and science, it usually refers to the general form of an equation describing the relationship between two or more variables. In economics and finance, it usually refers to a numerical expression that describes the relationship between two or more variables where one or more of these variables is price. .In mathematics, a mathematical formula is an equation in which symbols are used for quantities or types of quantities or for variables and parameters that often represent a relationship between two or more quantities. The symbols may represent numbers, operations on numbers such as addition, subtraction, multiplication and division, functions such as trigonometric functions (trigonometric functions are used to describe the relationships of anglesâ€”the sine function describes the changes in angle with time while the cosine function represents the changes in

### What is a percentage?

Percentages are a statistical measure of the proportion of a number or quantity as part of a total. A percentage is a way of expressing what part out of 100 something is. If you have 25% of something, that means that you have 25 units or parts out of 100. When we talk about percentages, we talk about them in terms of decimals. So 25% would be written as .25, 50% would be written as .5, and 75% would be written as .75.