Practice Proportionality in Math

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

A relationship where two quantities maintain a constant ratio: doubling one always doubles the other, giving y = kx.

If you double one, you double the other. Triple one, triple the other.

easy

A car travels 150 miles in 3 hours at constant speed. How far will it travel in 5 hours?

medium

The table shows: x = 2, y = 8; x = 5, y = 20; x = 9, y = 36. Determine whether y is proportional to x, and if so write the proportionality equation.

easy

If 12 apples cost \3.60, how much do 20$ apples cost?

medium

Is the relationship y = 3x + 2 proportional? Is y = 5x proportional? Explain.