1in. represents 324, how much does 5/4 represent?

Question

On a map, 1 in. represents 324 miles. How much does 5/4 in. represent?

Answer 1

1:324::1.25:x                statement of proportion

x = (1.25)(324)              product of means/extremes

x = 405

Answer 2

1 inch = 4 quarters of an inch

324 / 4 = 81

81 miles per quarter inch x 5 = 405 miles