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Finding the Fourth Proportional to 198.15, 273.38 and 115.18

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Solution

The fourth proportional to 198.15, 273.38 and 115.18 is: 158.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.15 : 273.38 = 115.18 : x
  2. Step 2: Convert to fraction form
    198.15/273.38 = 115.18/x
  3. Step 3: Cross multiply
    198.15x = 273.38 × 115.18
  4. Step 4: Simplify right side
    198.15x = 31,488.57
  5. Step 5: Solve for x
    x = 31,488.57/198.15
  6. Step 6: Final answer
    x = 158.92

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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.