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Finding the Fourth Proportional to 87.57, 130.59 and 86.76

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Solution

The fourth proportional to 87.57, 130.59 and 86.76 is: 129.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.57 : 130.59 = 86.76 : x
  2. Step 2: Convert to fraction form
    87.57/130.59 = 86.76/x
  3. Step 3: Cross multiply
    87.57x = 130.59 × 86.76
  4. Step 4: Simplify right side
    87.57x = 11,329.99
  5. Step 5: Solve for x
    x = 11,329.99/87.57
  6. Step 6: Final answer
    x = 129.38

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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.