Final answer:
To convert 72 pounds to kilograms using the proportion 1 kilogram = 2.2 pounds, multiply 72 pounds by 1 kilogram / 2.2 pounds. The result is approximately 32.73 kilograms.
Step-by-step explanation:
To convert kilograms to pounds using the proportion 1 kilogram = 2.2 pounds, you need to multiply the given weight in kilograms by the conversion factor. In this case, you need to convert 72 pounds to kilograms. So:
72 pounds * 1 kilogram / 2.2 pounds = 32.73 kilograms
Therefore, 72 pounds is equal to approximately 32.73 kilograms.