To find out how many medium loaves of bread can be made, we need to divide the amount of dough by the amount used for one loaf of bread. Let's calculate it: 3 3/4 pounds / 3/4 pound = 15/4 pounds / 3/4 pound = (15/4)/(3/4) = 15/4 * 4/3 = 15/3 = <<15/3=5>>5 medium loaves of bread. Answer: \boxed{5}.
