To convert a mixed number to an improper fraction multiply the whole number by the denominator and add the numerator to get the new numerator; the denominator stays the same:
3 3/4 = (3×4+3)/4 = 15/4
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The improper fraction for 4 over three is 4/3.
It is: 4 and 1/3 = 13/3 as an improper fraction
7 and 3/4 as an improper fraction is 31/4
7 and 3 over 4 is 73/4 as a mixed number (fraction) and: (7x4 + 3)/4 = 31/4 as an improper fraction.
That is 3/4 or 75%