A scale drawing of a car uses a scale of 1 inch = 3 feet. The length of the car in the scale drawing is 6 inches. Which proportion can be used to find the length of the actual car?

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[tex] \frac{1}{3} = \frac{x}{6} [/tex]
[tex] \frac{3}{6} = \frac{1}{x} [/tex]
[tex] \frac{1}{3} = \frac{6}{x} [/tex]
[tex] \frac{1}{6} = \frac{x}{3} [/tex]