You fill your car with 15 gallons of gas at a cost of $45. Using fractional notation, how do you write q proportion that shows how much 5 gallons of gas will cost? To represent the unknown cost, use the letter x.

Answer 1

The proportion would be:

15 gallons / $45 = 5 gallons / x

You can also write it as:

15/45 = 5/x