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Finding the Fourth Proportional to 87.64, 131.42 and 39.58

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Solution

The fourth proportional to 87.64, 131.42 and 39.58 is: 59.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.64 : 131.42 = 39.58 : x
  2. Step 2: Convert to fraction form
    87.64/131.42 = 39.58/x
  3. Step 3: Cross multiply
    87.64x = 131.42 × 39.58
  4. Step 4: Simplify right side
    87.64x = 5,201.60
  5. Step 5: Solve for x
    x = 5,201.60/87.64
  6. Step 6: Final answer
    x = 59.35

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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.