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Finding the Fourth Proportional to 87.57, 131.13 and 69.57

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Solution

The fourth proportional to 87.57, 131.13 and 69.57 is: 104.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.57 : 131.13 = 69.57 : x
  2. Step 2: Convert to fraction form
    87.57/131.13 = 69.57/x
  3. Step 3: Cross multiply
    87.57x = 131.13 × 69.57
  4. Step 4: Simplify right side
    87.57x = 9,122.71
  5. Step 5: Solve for x
    x = 9,122.71/87.57
  6. Step 6: Final answer
    x = 104.18

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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.