One way you might find the answer is to figure out how much volume is left in the pot, and also figure out the volume of an average meatball from this package. Here are some measurements and formulas to help you:
Volume of a sphere = 4/3 πr3
Volume of a cylinder = πr2h
Using a piece of paper or a calculator, calculate how many meatballs will cause the pot to overflow. Enter your answer in the notes box, and explain how you arrived at your answer.