Hello!
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 patients weight, how much antibiotic should be given to a patient who weighs 138 pounds?
Weighs ........ milligrams
92 -------------- 320
138 ------------- X
multiply the means by the extremes
92*x = 320*138
92x = 44160
x = 44160/92
x = 480
b) 480 milligrams
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