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Finding the Fourth Proportional to 198.18, 273.54 and 115.30

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Solution

The fourth proportional to 198.18, 273.54 and 115.30 is: 159.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.18 : 273.54 = 115.30 : x
  2. Step 2: Convert to fraction form
    198.18/273.54 = 115.30/x
  3. Step 3: Cross multiply
    198.18x = 273.54 × 115.30
  4. Step 4: Simplify right side
    198.18x = 31,539.16
  5. Step 5: Solve for x
    x = 31,539.16/198.18
  6. Step 6: Final answer
    x = 159.14

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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.