Final answer:
To determine cholesterol content in 7 ounces of lobster, a proportion can be used based on the known content in 3.1 ounces. After cross-multiplication and division, the exact calculated value for cholesterol in 7 ounces of lobster is 162.58 milligrams.
Step-by-step explanation:
To find out how much cholesterol is in 7 ounces of lobster, we need to set up a proportion since we know the amount in a 3.1-ounce serving. We can write this proportion as 72 mg cholesterol/3.1 oz = x mg cholesterol/7 oz, where x represents the cholesterol in 7 ounces of lobster. To solve for x, we cross-multiply and divide:
(72 mg/3.1 oz) × 7 oz = x
x = (72 × 7) / 3.1
x = 504 / 3.1
x = 162.58 mg
The answer choices do not have 162.58 mg, but the closest answer is 161.29 milligrams. However, given the precision of the original serving size data and the cholesterol content, we should go with the calculated exact value unless the question specifies a certain precision or rounding.