About this tool

Direct and inverse proportions.

How we calculate: Proporção direta (x = b·c/a) ou inversa (x = a·b/c).

🗓️ Values updated in Janeiro de 2026. Informational result, with no fiscal or official value.

➗ Rule of Three

Solve direct and inverse proportions quickly.

📖 How to use this tool

▾

Fill in the three known values.
Choose direct or inverse proportion.
The value of X is calculated automatically.

If A:

Corresponds to B:

Then C:

Proportion:

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⚠️ The results generated by this tool are based on public internet data and are for illustrative purposes only, with no fiscal, legal or official value. Always consult a qualified professional for important decisions. Privacy Policy · Personal Data Statement (LGPD) · Terms of Use.