Need help with setting up formula

Question

The amount of gas a helicopter uses is directly proportional to the number of hours spent flying. Flies 4hrs uses 60gallons. flies 5hrs uses x amount of gas. Need help setting up formula

Answer 1

Direct proportion problems have the following form for the equation: y = kx.

 

Here let's use x = kh where x is the amount of gas, h is the amount of gas, and k is a proportionality constant.

 

Solve for the proportionality constant with the information given.  Good luck.