A drawing of a surfboard in a catalog shows its length as 8 4/9 inches. Find the actual length of the surfboard if 1/2 inch length on the drawing corresponds to 3/8 foot of actual length.

3/8 of a foot = 3/8 x 12/1 or 4 1/2 inches

So our 1/2 inch grows by a factor of 9 because 4 1/2 : 1/2 = 9 Think how many 1/2 dollars are in 4 1/2 dollars. (Answer is 9)

So our 8 4/9 in the catalog has to grow the same

8 4/9 x 9 = 8 4/9 x 9/1 = 76/9 x 9/1 or 76 inches which is 6 ft 4 inches.

(76 : 12 = 6 r4)