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Finding the Fourth Proportional to 87.86, 131.89 and 75.10

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Solution

The fourth proportional to 87.86, 131.89 and 75.10 is: 112.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.86 : 131.89 = 75.10 : x
  2. Step 2: Convert to fraction form
    87.86/131.89 = 75.10/x
  3. Step 3: Cross multiply
    87.86x = 131.89 × 75.10
  4. Step 4: Simplify right side
    87.86x = 9,904.94
  5. Step 5: Solve for x
    x = 9,904.94/87.86
  6. Step 6: Final answer
    x = 112.74

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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.