A voice coach charges $165 for 1.5 hours of work. Which proportion can be used to find x, the number of dollars the voice coach charges for 4 hours of work?
Since the price is directly proportional to the number of hours worked, we can set up the proportion:
$165 / 1.5 hours = x / 4 hours
Solving for x:
1.5x = $165 * 4
1.5x = $660
x = $660 / 1.5
x = $440
Therefore, the voice coach charges $440 for 4 hours of work.