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Finding the Fourth Proportional to 42.32, 63.17 and 38.72

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Solution

The fourth proportional to 42.32, 63.17 and 38.72 is: 57.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.32 : 63.17 = 38.72 : x
  2. Step 2: Convert to fraction form
    42.32/63.17 = 38.72/x
  3. Step 3: Cross multiply
    42.32x = 63.17 × 38.72
  4. Step 4: Simplify right side
    42.32x = 2,445.80
  5. Step 5: Solve for x
    x = 2,445.80/42.32
  6. Step 6: Final answer
    x = 57.79

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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.