Cross-multiplication - Rule of Three
Description
In mathematics, specifically in elementary arithmetic and elementary algebra, given an equation between two fractions or rational expressions, one can cross-multiply to simplify the equation or determine the value of a variable.The Rule of Three was a shorthand version for a particular form of cross multiplication, often taught to students by rote.
Related formulasVariables
| a | 'extreme' of the proportion (dimensionless) |
| b | 'means' - same units as "x" (dimensionless) |
| c | 'means' - same units as "a" (dimensionless) |
| x | rule of three (dimensionless) |