Ratio & Proportion Calculator
Solve missing proportion values & simplify ratios:
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Presets:
Missing Term D
Calculated Value (D)
600
4 : 3 = 800 : 600
Cross-Multiplication Steps:
Frequently Asked Questions
Use cross-multiplication:
A × D = B × C. If D is the missing value, then D = (B × C) / A.
Find the Greatest Common Divisor (GCD) of both numbers and divide both terms by the GCD: GCD(24, 36) = 12, so 24/12 : 36/12 = 2 : 3.
An aspect ratio is the proportional relationship between width and height (e.g. 16:9 for widescreen video, 4:3 for standard TV, and 1:1 for square Instagram photos).