Question

To control an infection, a doctor recommends that a patient who weighs 92 pounds be given 320 milligrams of antibiotic. If the antibiotic is given proportionally according to the patient's weight, how much antibiotic should be given to a patient who weighs 138 pounds?

Answer 1

To be able to get down to a ratio to then find out the solution, we have to divide 320 by 92.

320/92=3.47

Now we have a ratio of 3.47:1
Multiply 3.47 by 138.

3.47×138=478.86

Answer 2

the answer is 480 milligrams