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Finding the Fourth Proportional to 131.92, 198.15 and 77.92

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Solution

The fourth proportional to 131.92, 198.15 and 77.92 is: 117.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.92 : 198.15 = 77.92 : x
  2. Step 2: Convert to fraction form
    131.92/198.15 = 77.92/x
  3. Step 3: Cross multiply
    131.92x = 198.15 × 77.92
  4. Step 4: Simplify right side
    131.92x = 15,439.85
  5. Step 5: Solve for x
    x = 15,439.85/131.92
  6. Step 6: Final answer
    x = 117.04

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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.