It would depend on how it is being used, but I would think it is referring to an amount of money or a number of items. A ceiling is the stopping point in a room so that's as high as you can go. Example, The ceiling on what I will spend is 3 million.
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The "square footage" is usually called the "area". A room that measures 3-ft long and 3-ft wide has -- 9 square feet on the floor -- 9 more square feet on the ceiling -- more square feet on the walls, but in order to count those, you have to know the height of the ceiling above the floor.
Well, 3/4 of 120 is 80. We're sure of that. You can take it to the bank and hang your hat on it. We're not so sure about "a room that measures 120 square feet". Is that the floor ? The ceiling ? Floor and ceiling both plus a couple of walls ? We're not sure.
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If you mean 3/4 of a million then it is: 750,000
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