You fill your car with 15 gallons of gas at a cost of $45. Using fractional notation, how do you write a proportion that shows how much 5 gallons of gas will cost? Use x

Question

to represent the unknown cost.(1 point)
Responses

15x=455
Start Fraction 15 over x End Fraction equals Start Fraction 45 over 5 End Fraction

15:45::x:5
ratio of 15 to 45 colon colon ratio of x to 5

1545=5x
Start Fraction 15 over 45 End Fraction equals Start Fraction 5 over x End Fraction

1545=x5

Answer 1

To find the cost of 5 gallons of gas using a proportion, we can set it up as follows:

\[ \frac{15}{45} = \frac{5}{x} \]

This means that for every 15 gallons costing $45, we can find the cost \(x\) for 5 gallons.

Therefore, the correct fraction notation for the proportion is:

\(\frac{15}{45} = \frac{5}{x}\)