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Program: PROPORTN
PROPORTN
- Finds the missing value in a direct or inverse proportion, given the other three values.
Useful for:
- SAT
- ACT
- Algebra 1
- Algebra 2
- Geometry
Try these problems using PROPORTN:
Example 2
Q: x varies inversely with y. If x=4 when y=25, what is x when y is 2?
Solution:
Run PROPORTN. How?
Enter the first pair
of x and y values
as shown:
Select choice 2, that
you have the second
y-value.
Enter y2 = 2.
Choose 2 because
the question says
x and y vary inversely.
The program reports:
Interpretation:
x = 50
See Example 1
