How the rule of three works
If a relates to b as c relates to d, then d = b×c/a under direct proportion. Inverse proportion needs another formula.
Everyday Math
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Üç İşlem / Orantı
a/b = c/d orantısında d değerini bulun.
Last updated: 2026-08-12
Sources
- CSGB / Asgari Ücret Tespit Komisyonu (2026 brüt/net)
- GİB gelir vergisi tarifesi 2026
- EPDK mesken elektrik kademeli tarife (yaklaşık)
- BOTAŞ / dağıtım şirketleri doğalgaz (yaklaşık)
- Hazine ve Maliye — kıdem tazminatı tavanı 1. dönem 2026
How is it calculated?
d = b×c / a
d=b×c/a
Example
2/10 = 5/d → d=25.
Guide
Rule of three: find the fourth proportional from three known values. For shopping, production, and unit scaling. Informational only.
2026 notes and common mistakes
Applying direct proportion to inverse labour problems or mis-picking a are common errors.
Tips
- Write the three knowns before solving.
- For information only—label units on the answer.
Sources: Basic mathematics · Rule-of-three references
FAQ
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