1. Modeling with proportions
4.4 Notes
Modeling with proportions

2. Warm-UP Solve for x. Leave answer as a simplified fraction.
If these ratios are equal, then what’s another equation that’s true using these four variables.
KNOWN AS:
Cross Product Property

3. Vocabulary Ratio: compares quantities by division (think fraction)
Example:
Proportion: a statement that says two ratios (fractions) are equal

4. Using Cross Products
Solve each proportion. 1) 2)

5. Application: Property Tax
The property tax on a house with an assessed value of $480,000 is $5,760. Determine the property tax on a house with an assessed value of $600,000 assuming the same tax rate.

6. Application: Capture/Recapture
Wildlife biologists catch, tag, and release 120 deer back into a wildlife refuge. Two weeks later they observe a sample of 150 deer, 25 of which are tagged. Approximately how many deer are in the refuge?

7. 4.4 HW
P # 13-17(odd), 25-29(odd), 34-36