**Answer:**

**138 pound**

**Step-by-step explanation:**

Given

A certain medicine is given in an amount proportional to a patients body weight.

thus,

ratio will be

**amount of medicine: weight of patient**

Given

Suppose a person weighted 104 pounds requires 156 milligrams of medicine.

amount of medicine = 156 milligram

weight of patient = 104 pound

Thus, ratio will be = 156/104

___________________________

What is the weight of a patient who requires 207 milligrams of medicine

Let the weight of weight of patient here be x

thus, ratio in this case will be

207/x

**we also know in ratio and proportion that **

**if two ratio a:b and c:d are equal then a:c = c:d**

**here also the ratio will be same**

Thus,

156/104 = 207/x

=> 156x = 207*104 = 21,528

=> x = 21,528/156 = 138

**Thus, weight of patient is 138 pound.**