Proportion Calculator

Solve proportions and find missing values using the cross-multiplication method. Enter three known values to calculate the fourth unknown value in the proportion equation a/b = c/x.

How to Use the Proportion Calculator

This calculator solves proportion problems using the formula: a/b = c/x. Follow these simple steps:

• Enter the first value (a) in the "Value A" field
• Enter the second value (b) in the "Value B" field
• Enter the third value (c) in the "Value C" field
• Click "Calculate X" to find the unknown value
• The result will be displayed below, showing the value of x

Understanding Proportions

A proportion is an equation that states that two ratios are equal. In the form a/b = c/x, the calculator uses cross-multiplication to solve for the unknown value x. The formula used is: x = (b × c) / a

Example Calculations

• Example 1: If 2/4 = 3/x, then x = (4 × 3) / 2 = 6
• Example 2: If 5/10 = 7/x, then x = (10 × 7) / 5 = 14
• Example 3: If 3/6 = 9/x, then x = (6 × 9) / 3 = 18

Common Applications

• Scaling recipes and ingredient measurements
• Converting units and measurements
• Calculating map distances and scales
• Solving ratio problems in mathematics
• Determining quantities in chemistry and science
• Financial calculations and interest rates