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Finding the Fourth Proportional to 130.62, 195.50 and 81.92

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Solution

The fourth proportional to 130.62, 195.50 and 81.92 is: 122.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.62 : 195.50 = 81.92 : x
  2. Step 2: Convert to fraction form
    130.62/195.50 = 81.92/x
  3. Step 3: Cross multiply
    130.62x = 195.50 × 81.92
  4. Step 4: Simplify right side
    130.62x = 16,013.97
  5. Step 5: Solve for x
    x = 16,013.97/130.62
  6. Step 6: Final answer
    x = 122.60

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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.