Day 2/Lesson 2: Problem Solving in Geometry with Proportions
Goals:
1. Use properties of proportions
2. Use proportions to solve problems.
Definitions:
Practice with Geometric Mean:
Find the geometric mean of the two numbers.
1. 8 and 12
2. 18 and 30
3. a and 4a
Click here to see how the Geometric Mean is used to prove the Pythagorean theorem:
More Properties of Proportions:
Using the Properties of Proportions:
Applications using Proportions:
1.
4. A quality control engineer for a certain buyer found that the ratio of defective units to total units is 1:35. At this rate, what is the expected number of defective units in a shipment of 28,000?
