Finding the Fourth Proportional to 86.18, 129.14 and 47.66
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Solution
The fourth proportional to 86.18, 129.14 and 47.66 is: 71.42
Step by Step Solution
- Step 1: Write the proportion equation
86.18 : 129.14 = 47.66 : x - Step 2: Convert to fraction form
86.18/129.14 = 47.66/x - Step 3: Cross multiply
86.18x = 129.14 × 47.66 - Step 4: Simplify right side
86.18x = 6,154.81 - Step 5: Solve for x
x = 6,154.81/86.18 - Step 6: Final answer
x = 71.42
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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.