Solve proportions and ratios in one step. Pick direct (a/b = c/d), inverse (a×b = c×d), or continued (a/b = b/c), enter three numbers, leave one empty, and get the missing value with working shown.
Leave one field empty to solve for that value.
For direct proportion a/b = c/d you cross-multiply to get a×d = b×c, then solve for the unknown. For inverse proportion a×b = c×d you keep the product equal and divide. For continued proportion a/b = b/c you use b² = a×c and take the square root when solving for b.
