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Finding the Fourth Proportional to 81.76, 112.68 and 62.38

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Solution

The fourth proportional to 81.76, 112.68 and 62.38 is: 85.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.76 : 112.68 = 62.38 : x
  2. Step 2: Convert to fraction form
    81.76/112.68 = 62.38/x
  3. Step 3: Cross multiply
    81.76x = 112.68 × 62.38
  4. Step 4: Simplify right side
    81.76x = 7,028.98
  5. Step 5: Solve for x
    x = 7,028.98/81.76
  6. Step 6: Final answer
    x = 85.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.