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Proportion solver

Direct proportion a/b = c/x → x = bc/a.

Client
x = 15.000000

Nearby workflows on Toolcore

  • Rule of three (proportion) — Solve a:b = c:x for x—direct proportion helper. when units or numeric output should be checked on a related calculator.
  • Ratio simplify — Reduce ratio a:b to smallest integers. when units or numeric output should be checked on a related calculator.
  • Percentage calculator — Percent of a value, ratio to percent, and percent change—no server round-trip. when units or numeric output should be checked on a related calculator.
  • Math expression evaluator — Evaluate basic + − × ÷ arithmetic with parentheses in your browser—no variables. when units or numeric output should be checked on a related calculator.

Common use cases

  • Proportion solver for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Open the page directly—multi-field inputs are not URL-prefilled.

More tools

Related utilities you can open in another tab—mostly client-side.