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Finding the Fourth Proportional to 87.99, 131.13 and 87.87

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Solution

The fourth proportional to 87.99, 131.13 and 87.87 is: 130.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.99 : 131.13 = 87.87 : x
  2. Step 2: Convert to fraction form
    87.99/131.13 = 87.87/x
  3. Step 3: Cross multiply
    87.99x = 131.13 × 87.87
  4. Step 4: Simplify right side
    87.99x = 11,522.39
  5. Step 5: Solve for x
    x = 11,522.39/87.99
  6. Step 6: Final answer
    x = 130.95

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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.