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Finding the Fourth Proportional to 198.38, 273.90 and 124.73

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Solution

The fourth proportional to 198.38, 273.90 and 124.73 is: 172.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.38 : 273.90 = 124.73 : x
  2. Step 2: Convert to fraction form
    198.38/273.90 = 124.73/x
  3. Step 3: Cross multiply
    198.38x = 273.90 × 124.73
  4. Step 4: Simplify right side
    198.38x = 34,163.55
  5. Step 5: Solve for x
    x = 34,163.55/198.38
  6. Step 6: Final answer
    x = 172.21

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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.