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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 1
Q: x varies directly with y. If x=4 when y=5, what is y when x is 7?
Solution:
Run PROPORTN. How?
Enter the first pair
of x and y values
as shown:
Select choice 1, that
you have the second
x-value.
Enter x2 = 7.
Choose 1 because
the question says
x and y vary directly.
The program reports:
Interpretation:
y = 8.75
See Example 2
