Toolbox
A formula sheet plus reference tools for calculator, equation solver, units, elements, graphs and molecules.
Ratio calculator
Solve proportions, simplify ratios, scale and share by ratio
Pick the position of the unknown, then fill in the three known values
:=:x
Unknown
Examples
Unknown x6
Ratio value2/3
6 / 6
- 1Given2:3=4:x
- 2Cross multiply2×x=3×4
Product of the extremes equals product of the means
- 3Isolate xx=3 × 42
Divide both sides by 2 to isolate the unknown
- 4Computex=12÷2=6
- 5Resultx=6
- 6Check2:3=4:6
Both ratios equal 2/3, so the proportion holds
Cross products are equal in a proportion · results are reduced · decimals and fractions accepted