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Finding the Fourth Proportional to 42.87, 63.96 and 38.13

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Solution

The fourth proportional to 42.87, 63.96 and 38.13 is: 56.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.87 : 63.96 = 38.13 : x
  2. Step 2: Convert to fraction form
    42.87/63.96 = 38.13/x
  3. Step 3: Cross multiply
    42.87x = 63.96 × 38.13
  4. Step 4: Simplify right side
    42.87x = 2,438.79
  5. Step 5: Solve for x
    x = 2,438.79/42.87
  6. Step 6: Final answer
    x = 56.89

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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.