Question

Bananas are $0.59/pounds.  What is the constant of proportionality?

Answer 1

The constant proportionality is the proportionality of 59. Because it is the price, you just move the decimal point two places over to the left.
If you do this correctly you will get .59

Answer 2

For this case, the first thing we must do is define variables.

We have then:

x: amount of weight in pounds

y: total cost of bananas.

The equation that models the problem is:

$y = 0.59x$

We observe that the relationship is linear. Therefore, the variables are proportional.

The proportionality constant is:

$k = 0.59$

Answer:

the constant of proportionality is:

$k = 0.59$