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Finding the Fourth Proportional to 198.27, 297.47 and 81.18

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Solution

The fourth proportional to 198.27, 297.47 and 81.18 is: 121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.27 : 297.47 = 81.18 : x
  2. Step 2: Convert to fraction form
    198.27/297.47 = 81.18/x
  3. Step 3: Cross multiply
    198.27x = 297.47 × 81.18
  4. Step 4: Simplify right side
    198.27x = 24,148.61
  5. Step 5: Solve for x
    x = 24,148.61/198.27
  6. Step 6: Final answer
    x = 121.80

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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.