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Finding the Fourth Proportional to 197.98, 273.24 and 128.11

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Solution

The fourth proportional to 197.98, 273.24 and 128.11 is: 176.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.98 : 273.24 = 128.11 : x
  2. Step 2: Convert to fraction form
    197.98/273.24 = 128.11/x
  3. Step 3: Cross multiply
    197.98x = 273.24 × 128.11
  4. Step 4: Simplify right side
    197.98x = 35,004.78
  5. Step 5: Solve for x
    x = 35,004.78/197.98
  6. Step 6: Final answer
    x = 176.81

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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.