Finding the Fourth Proportional to 82.24, 122.65 and 80.80
Calculator
Solution
The fourth proportional to 82.24, 122.65 and 80.80 is: 120.50
Step by Step Solution
- Step 1: Write the proportion equation
82.24 : 122.65 = 80.80 : x - Step 2: Convert to fraction form
82.24/122.65 = 80.80/x - Step 3: Cross multiply
82.24x = 122.65 × 80.80 - Step 4: Simplify right side
82.24x = 9,910.12 - Step 5: Solve for x
x = 9,910.12/82.24 - Step 6: Final answer
x = 120.50
Related Problems
Find fourth proportional to 41.12, 61.33 and 40.40
Half scale
Find fourth proportional to 164.48, 245.30 and 161.60
Double scale
Find fourth proportional to 83.24, 124.14 and 81.80
Similar ratio
Find fourth proportional to 123.36, 183.98 and 121.20
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.