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Finding the Fourth Proportional to 42.66, 63.90 and 39.96

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Solution

The fourth proportional to 42.66, 63.90 and 39.96 is: 59.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.66 : 63.90 = 39.96 : x
  2. Step 2: Convert to fraction form
    42.66/63.90 = 39.96/x
  3. Step 3: Cross multiply
    42.66x = 63.90 × 39.96
  4. Step 4: Simplify right side
    42.66x = 2,553.44
  5. Step 5: Solve for x
    x = 2,553.44/42.66
  6. Step 6: Final answer
    x = 59.86

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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.