Leave one field blank to solve for it
:=:
Formula
Cross multiply: A × D = B × CRatio & Proportion Calculator
Ratio & Proportion Calculator
Solve A:B = C:D for any unknown value by leaving that field empty. Useful for scale models, recipe scaling, and map proportions.
System Generated Results
Solved Value of D
20.0000
Leave exactly one field blank
How to use: Fill in three of the four values (A, B, C, D). Leave exactly one blank — the calculator will solve for it using cross-multiplication.
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