Rule of Three Calculator by Rechnerzentrale

If stands for – what does stand for? Relationship:

Proportional: double the amount, double the value – e.g. price and quantity.

Unknown value x

2.5

If 3 stands for 1.5, then 5 stands for 2.5.

How this was calculated

x = b ÷ a × c

x = 1.5 ÷ 3 × 5 = 2.5

First reduce to 1 (1 → 0.5), then multiply by c.