Ratio & Proportion Calculator
Solve ratios and proportions easily. Find missing values in proportional relationships.
Proportion: a/b = c/d
=
Results
Value of d
8
Simplified Ratio (a:b)
3:4
a/b as Decimal
0.7500
a/b as Percent
75.00%
Proportion Formula
Cross Multiplication
If a/b = c/d, then a × d = b × c
Solving for Each Variable
- • a = (b × c) / d
- • b = (a × d) / c
- • c = (a × d) / b
- • d = (b × c) / a