Proportion Solver Calculator ← Calculator LibraryEverydayProportion Solver CalculatorSolve a/b = c/x for the missing fourth value. StyleModernVintageRetro a (nonzero) b (nonzero) c Calculate & explainReset example Both denominators must be nonzero; a cannot be zero for a unique solution. Open Dual Calculators → Share this page Share Facebook X LinkedIn Reddit Pinterest WhatsApp Telegram Threads Bluesky Tumblr Email Text Copy link Save this math resource for laterSave to Pinterest