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
It enforces a : b = c : x, so x = (b × c) ÷ a. The check line verifies a ÷ b ≈ c ÷ x numerically. a cannot be zero.
This calculator uses plain decimal numbers. If a result looks wrong, check whether you used a comma instead of a dot (or vice versa) where the field expects one.