Firstly, there is no indication as to what units are used for 72 x 48. 72 inches x 48 inches or 72 miles x 48 miles or whatever. Second, it looks like they are a measure of an area. In that case, there are no feet in an area since a foot is a linear measure, not a measure of an area.
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1 foot = 12 inch 72" x 108 " = (72/12 ) feet x (108/12) feet = 6 feet x 9 feet = 54 square feet
1.5 x 48 = 72
48 x 72 = 3456
lcm(48, 72) = 144 48 = 24 x 3 72 = 23 x 32 lcm = 24 x 32 = 144
If the given dimensions are in feet then 4*4*72 = 1152 cubic feet