Prove Your Understanding of Constant of Proportionality with this Quiz

Without even knowing it, you divide three by two and know the tomato can will cost $1.50. What you just did is find the constant of proportionality for the cost of a tomato can. The constant of proportionality is the ratio between two directly proportional quantities. In our tomato example, that ratio is $3.00/2, which equals $1.50. Two quantities are directly proportional when they increase and decrease at the same rate. When you buy more or less, the total price of the tomato cans in this example.

2. directly

4. directly