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Finding the Fourth Proportional to 198.07, 273.32 and 115.15

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Solution

The fourth proportional to 198.07, 273.32 and 115.15 is: 158.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.07 : 273.32 = 115.15 : x
  2. Step 2: Convert to fraction form
    198.07/273.32 = 115.15/x
  3. Step 3: Cross multiply
    198.07x = 273.32 × 115.15
  4. Step 4: Simplify right side
    198.07x = 31,472.80
  5. Step 5: Solve for x
    x = 31,472.80/198.07
  6. Step 6: Final answer
    x = 158.90

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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.