Question

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 to represent the unknown cost.(1 point)
Responses

1545=x5
Start Fraction 15 over 45 End Fraction equals Start Fraction x over 5 End Fraction

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

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

15:45::x:5
ratio of 15 to 45 colon colon ratio of x to 5
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Answer 1

To set up a proportion using fractional notation to find out how much 5 gallons of gas will cost (where \( x \) represents the unknown cost), we can use the information given about the cost of gas.

The proportion can be written as:

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

So the correct response is:

**Start Fraction 15 over 45 End Fraction equals Start Fraction x over 5 End Fraction**