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Finding the Fourth Proportional to 62.72, 93.92 and 39.92

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Solution

The fourth proportional to 62.72, 93.92 and 39.92 is: 59.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.72 : 93.92 = 39.92 : x
  2. Step 2: Convert to fraction form
    62.72/93.92 = 39.92/x
  3. Step 3: Cross multiply
    62.72x = 93.92 × 39.92
  4. Step 4: Simplify right side
    62.72x = 3,749.29
  5. Step 5: Solve for x
    x = 3,749.29/62.72
  6. Step 6: Final answer
    x = 59.78

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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.