Constant of Proportionality Calculator

Find the constant k in a proportional relationship y = kx.

Constant of proportionality 2.5

Formula: k = y ÷ x

Step-by-step with your numbers:

1. Values used:

2. x = 8

3. y = 20

5. Constant of proportionality = y / x = 20 / 8 = 2.5

Did we solve your problem today?

When two quantities are proportional, their ratio is the constant of proportionality.

The math behind it

For y = kx, the constant is k = y ÷ x. It stays the same for every matching pair.

y = 20 when x = 8 → k = 2.5.

How is k used?

Once you know k, you can predict y for any x: y = kx.