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Finding the Fourth Proportional to 87.81, 131.71 and 63.91

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Solution

The fourth proportional to 87.81, 131.71 and 63.91 is: 95.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.81 : 131.71 = 63.91 : x
  2. Step 2: Convert to fraction form
    87.81/131.71 = 63.91/x
  3. Step 3: Cross multiply
    87.81x = 131.71 × 63.91
  4. Step 4: Simplify right side
    87.81x = 8,417.59
  5. Step 5: Solve for x
    x = 8,417.59/87.81
  6. Step 6: Final answer
    x = 95.86

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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.