A model car is built using a 1 to4 scale on the model the car is 3 point 6 inches determine the actual length of the car?

Multiply 3.6 inches by 4 = 14.4 inches. Since this does not make any sense, the scale must be wrong or the car is meant to be driven by Lilliputians. Are you sure that the scale is not 40 to 1 or four feet to one inch or something else?