I want to know if the problem is worded exactly like that "what fraction of the hero" will each guest get?
Each guest will get 1/72 of the hero. There's 72 guests so they're getting 1/72 of the hero. That is the "fraction of the hero" they get.
The wording does not ask for the measurement they will get. It doesn't say what fraction of a foot or how many inches or anything indicating measurement. If that is what they mean, they should say so.
But if you really want the fraction of a foot (which is different than a fraction of the hero), picture a 6-foot hero, that needs to be divided down into 72 pieces. When you need to divide something into parts like that, it's literally a division, in that order.
i.e. 6 ft divided into 72 pieces = 6ft / 72 which reduces to 1/12 ft. (divide top & bottom by 6 to reduce)
If you needed it in inches I think it's easier to convert to inches to start with: 6 ft x 12 = 72 inches.
So 72 inches divided into 72 pieces = 72 " / 72 = 1" per guest