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Finding the Fourth Proportional to 61.62, 92.24 and 39.87

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Solution

The fourth proportional to 61.62, 92.24 and 39.87 is: 59.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.62 : 92.24 = 39.87 : x
  2. Step 2: Convert to fraction form
    61.62/92.24 = 39.87/x
  3. Step 3: Cross multiply
    61.62x = 92.24 × 39.87
  4. Step 4: Simplify right side
    61.62x = 3,677.56
  5. Step 5: Solve for x
    x = 3,677.56/61.62
  6. Step 6: Final answer
    x = 59.68

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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.