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Finding the Fourth Proportional to 40.87, 60.90 and 39.49

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Solution

The fourth proportional to 40.87, 60.90 and 39.49 is: 58.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.87 : 60.90 = 39.49 : x
  2. Step 2: Convert to fraction form
    40.87/60.90 = 39.49/x
  3. Step 3: Cross multiply
    40.87x = 60.90 × 39.49
  4. Step 4: Simplify right side
    40.87x = 2,404.96
  5. Step 5: Solve for x
    x = 2,404.96/40.87
  6. Step 6: Final answer
    x = 58.85

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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.