A Rule of Three calculator solves proportion problems by finding an unknown value when three values are known. It uses the principle that the product of the extremes equals the product of the means, commonly applied in areas like finance, conversions, and ratios.

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.