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Finding the Fourth Proportional to 198.63, 273.96 and 128.61

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Solution

The fourth proportional to 198.63, 273.96 and 128.61 is: 177.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.63 : 273.96 = 128.61 : x
  2. Step 2: Convert to fraction form
    198.63/273.96 = 128.61/x
  3. Step 3: Cross multiply
    198.63x = 273.96 × 128.61
  4. Step 4: Simplify right side
    198.63x = 35,234.00
  5. Step 5: Solve for x
    x = 35,234.00/198.63
  6. Step 6: Final answer
    x = 177.39

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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.