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Finding the Fourth Proportional to 103.92, 155.76 and 76.85

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Solution

The fourth proportional to 103.92, 155.76 and 76.85 is: 115.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.92 : 155.76 = 76.85 : x
  2. Step 2: Convert to fraction form
    103.92/155.76 = 76.85/x
  3. Step 3: Cross multiply
    103.92x = 155.76 × 76.85
  4. Step 4: Simplify right side
    103.92x = 11,969.38
  5. Step 5: Solve for x
    x = 11,969.38/103.92
  6. Step 6: Final answer
    x = 115.18

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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.