Review the Math Notes below from Lesson 3.1.3.
Although this problem is not about triangles, it does deal with corresponding measurements--the foot size and body length of hadrosaurs.
Set up a proportional equation comparing foot size and length in adult and juvenile hadrosaurs.
See the example below, one of several possibilities.
Be careful with the units! Try converting one set of measurements so all measurements are in the same units.
Around 20.7 inches, or 1.7 feet.