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Finding the Fourth Proportional to 198.27, 273.60 and 115.40

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Solution

The fourth proportional to 198.27, 273.60 and 115.40 is: 159.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.27 : 273.60 = 115.40 : x
  2. Step 2: Convert to fraction form
    198.27/273.60 = 115.40/x
  3. Step 3: Cross multiply
    198.27x = 273.60 × 115.40
  4. Step 4: Simplify right side
    198.27x = 31,573.44
  5. Step 5: Solve for x
    x = 31,573.44/198.27
  6. Step 6: Final answer
    x = 159.24

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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.