In this interactive, help Bianca solve some tricky problems using ratio and proportion. Learn that some body parts are proportional to others -- that is, the length of one part is always the same multiple of another -- so by measuring one part, you can predict the length of others or even the full height of the person. Then, apply this knowledge to help Bianca do some problem solving. In the accompanying classroom activity, students check to see if the examples shown in the interactive are accurate for them. They also use measuring tape to explore other proportional relationships on the human body.