Proportion Solver
Solve proportions and find the missing value in A/B = C/D. Free cross-multiplication calculator.
How to Use This Calculator
Enter your values in the fields above and click "Calculate" to get instant results. This proportion solver provides accurate results with step-by-step explanations.
Formula
A/B = C/D, so D = (B x C) / A
Quick Examples
- 3/4 = 6/? -> ? = 8
- 2/5 = ?/15 -> ? = 6
- 1/3 = 4/12 -> Proportional
Frequently Asked Questions
How do I solve a proportion?
Use cross-multiplication: A x D = B x C. If solving for D, then D = (B x C) / A.
What is a proportion?
A proportion is an equation stating that two ratios are equal, such as A/B = C/D.