Introduction to Solving Proportions and their Applications

What you’ll learn to do: Solve proportions and their applications

A surgeon in the operating room

Calculating the correct amount of anesthesia for a surgery requires using proportions.

Dr. Roberts is an anesthesiologist. When a patient undergoes surgery, she has to calculate the right dose of anesthesia to administer to keep the patient unconscious for the duration of the surgery. The amount of anesthesia is usually proportional to the person’s weight. A 125-pound person undergoing surgery for 3 hours will need a different amount of anesthesia than a 225-pound person undergoing surgery for 3 hours. Dr. Roberts must carefully calculate proportions in order to make sure her patients receive the correct amounts of anesthesia for their surgeries. In this section, you’ll learn how to solve proportions and apply percents to equations including proportions.

Before you get started in this module, try a few practice problems and review prior concepts.

Readiness Quiz


If you missed this problem, review the following video.


If you missed this problem, review this video.


If you missed this problem, review the video below.