There isn't one. You can always put another nine on it.
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Yes.
It is not possible. There is no fraction equivalent to 1/73 which has a denominator less than 50.In fact, if p is any prime greater than 50, then for any fraction q/p, there is no equivalent fraction with denominator less than 50.
66
You can. The greatest fraction in the set {1/2, 1/4, 1/8, 1/16, ... } is 1/2 which is less than 1!
If the three digits are to be used once only then the greatest fraction is 54/3. If the required fraction is less than 1 then the solution is 5/34.