Finds x so that a : b = c : x
Proportions express the same relative relationship on two scales. After you enter a, b, and c, the tool finds x so that the two ratios match. Division by zero is rejected. Watch units: all four quantities should represent the same kind of measure when applied to real problems.
Finds x so that a : b = c : x
a : b = c : x, solved as x = b×c÷a when a ≠ 0.
Division by zero; the ratio a : b would not define a scale.
Keep a,b,c in consistent units (e.g., all lengths) so x is interpretable.
Decimals are fine; the tool uses floating-point math—tiny rounding noise can appear in extreme cases.
Equal ratios mean the relative scale from a to b matches c to x.
Runs locally in your browser.