numbers-converter

Rule of Three Simples (Calculator)

A is to B as C is to X.Simple Rule of Three Calculator
What is the Three Simple Rule?
In mathematics, the rule of simple three is a way to discover a value from three others.

copy.svg
Copied!
Invalid value! Please enter a new value.
No values entered! Please enter the values.

Check out other utilities

Numbers
Cross-multiplicationPercentage CalculatorRandom number generatorRatio MatrixRoot CalculatorRatio CalculatorRatio Simplifier
Dates
Date DifferenceAdd Or SubtractFormat date Weeks to months Age Calculator Pace Calculator

Simple Rule of Three

Explanation

The Simple Rule of Three is a mathematical method used to solve proportions and establish relationships between proportional quantities. This technique is especially useful when we know three values and want to find a fourth related one.

The core principle is that if two quantities are proportional, the ratio between them remains constant. To solve a problem using the Simple Rule of Three, follow these steps:

  1. Identify the quantities and values: Define the two proportional quantities and the known values.
  2. Set up the proportion: Create a proportion equation with the known values.
  3. Solve for the unknown: Solve the equation to find the unknown value.

For example, if 2 meters correspond to 5 seconds, we can use the rule to find how long it takes to travel 8 meters.

Basic formula:

a⁄b = c⁄d

Where:

  • a and c: values of one quantity.
  • b and d: values of the other quantity.

This method is widely used in mathematics, physics, chemistry, and any field that requires proportional analysis.