64.8 pounds = 1036.8 ounces

Since the volume of the cheese is directly proportional to the weight of the cheese, the ratio of the volumes of the cubes of cheese is :

\(\dfrac{1036.8}{0.6}=1728\)

The ratio of the edges of the cubes of cheese is : \(\sqrt[3]{1728}=12\)

The length of the cube of the second cheese is : 12 in = 1 ft

64,8 pounds = 1036,8 ounces

=> the edge length is: \(\dfrac{1036,8}{0,6}\cdot1=1728\) inch