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Finding the Fourth Proportional to 198.62, 274.11 and 115.73

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Solution

The fourth proportional to 198.62, 274.11 and 115.73 is: 159.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.62 : 274.11 = 115.73 : x
  2. Step 2: Convert to fraction form
    198.62/274.11 = 115.73/x
  3. Step 3: Cross multiply
    198.62x = 274.11 × 115.73
  4. Step 4: Simplify right side
    198.62x = 31,721.38
  5. Step 5: Solve for x
    x = 31,721.38/198.62
  6. Step 6: Final answer
    x = 159.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.