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Finding the Fourth Proportional to 198.38, 273.69 and 136.31

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Solution

The fourth proportional to 198.38, 273.69 and 136.31 is: 188.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.38 : 273.69 = 136.31 : x
  2. Step 2: Convert to fraction form
    198.38/273.69 = 136.31/x
  3. Step 3: Cross multiply
    198.38x = 273.69 × 136.31
  4. Step 4: Simplify right side
    198.38x = 37,306.68
  5. Step 5: Solve for x
    x = 37,306.68/198.38
  6. Step 6: Final answer
    x = 188.06

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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.