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Finding the Fourth Proportional to 47.38, 71.12 and 42.88

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Solution

The fourth proportional to 47.38, 71.12 and 42.88 is: 64.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.38 : 71.12 = 42.88 : x
  2. Step 2: Convert to fraction form
    47.38/71.12 = 42.88/x
  3. Step 3: Cross multiply
    47.38x = 71.12 × 42.88
  4. Step 4: Simplify right side
    47.38x = 3,049.63
  5. Step 5: Solve for x
    x = 3,049.63/47.38
  6. Step 6: Final answer
    x = 64.37

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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.