Finding the Fourth Proportional to 86.09, 129.18 and 82.17
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Solution
The fourth proportional to 86.09, 129.18 and 82.17 is: 123.31
Step by Step Solution
- Step 1: Write the proportion equation
86.09 : 129.18 = 82.17 : x - Step 2: Convert to fraction form
86.09/129.18 = 82.17/x - Step 3: Cross multiply
86.09x = 129.18 × 82.17 - Step 4: Simplify right side
86.09x = 10,614.72 - Step 5: Solve for x
x = 10,614.72/86.09 - Step 6: Final answer
x = 123.31
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.