A Rule of Three calculator solves proportion problems by finding an unknown value when three values are known. It uses the formula:

𝑎
𝑏
=
𝑐
𝑥
b
a
​
=
x
c
​

Where
𝑎
a,
𝑏
b, and
𝑐
c are known, and
𝑥
x is the unknown. It helps solve problems involving direct or inverse proportions.

A Rule of Three Percentage Calculator is a tool used to quickly calculate proportions or percentages based on three known values. By applying the rule of three, it determines how one value relates to another proportionally, helping solve problems like scaling, discounts, or ratios in an easy and efficient way.