Proportion Calculator
Enter any 3 values to solve for the unknown variable using algebraic cross-multiplication.
Solved Equation
3 : 4 = 6 : 8
Step-by-Step Algebraic Proof:
- State the proportion formula: A / B = C / D → A × D = B × C.
- Substitute known values: 3 × D = 4 × 6.
- Calculate cross product: 3 × D = 24.
- Divide both sides by 3: D = 24 ÷ 3 = 8.
How the Cross-Multiplication Method Works
Cross-multiplication is an algebraic technique used to solve proportion equations. When two fractions or ratios are equal, their cross products are also strictly equal.
Solving for D:
D = (B × C) ÷ A Solving for C:
C = (A × D) ÷ B Notice an issue or calculation discrepancy?
We strive for 100% mathematical precision. If you encounter an unexpected calculation result, broken input, or unclear explanation on Proportion Calculator, please let our editorial team know.