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Finding the Fourth Proportional to 137.92, 206.88 and 76.96

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Solution

The fourth proportional to 137.92, 206.88 and 76.96 is: 115.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.92 : 206.88 = 76.96 : x
  2. Step 2: Convert to fraction form
    137.92/206.88 = 76.96/x
  3. Step 3: Cross multiply
    137.92x = 206.88 × 76.96
  4. Step 4: Simplify right side
    137.92x = 15,921.48
  5. Step 5: Solve for x
    x = 15,921.48/137.92
  6. Step 6: Final answer
    x = 115.44

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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.