Worked examples
Two examples
Example 1
Is y proportional to x in this table?
| x | 2 | 5 | 8 |
|---|---|---|---|
| y | 6 | 15 | 24 |
- Divide each y by its x: 6 ÷ 2 = 3, 15 ÷ 5 = 3, 24 ÷ 8 = 3.
- The ratio is always 3.
Answer: Yes
Example 2
Is y proportional to x in this table?
| x | 1 | 2 | 4 |
|---|---|---|---|
| y | 5 | 8 | 14 |
- 5 ÷ 1 = 5, 8 ÷ 2 = 4, 14 ÷ 4 = 3.5.
- The ratios are not all the same.
Answer: No
Where this is taught: Ratio, Proportion, and Percent, “Proportional, or not?”
The drill
Ten problems
This drill also has challenge problems. They use the same skill, set up the way the GED test sometimes sets up a problem, so that it looks new at first.
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.