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Finding the Fourth Proportional to 198.29, 273.56 and 128.33

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Solution

The fourth proportional to 198.29, 273.56 and 128.33 is: 177.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.29 : 273.56 = 128.33 : x
  2. Step 2: Convert to fraction form
    198.29/273.56 = 128.33/x
  3. Step 3: Cross multiply
    198.29x = 273.56 × 128.33
  4. Step 4: Simplify right side
    198.29x = 35,103.95
  5. Step 5: Solve for x
    x = 35,103.95/198.29
  6. Step 6: Final answer
    x = 177.03

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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.