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Finding the Fourth Proportional to 197.99, 273.27 and 128.13

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Solution

The fourth proportional to 197.99, 273.27 and 128.13 is: 176.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.99 : 273.27 = 128.13 : x
  2. Step 2: Convert to fraction form
    197.99/273.27 = 128.13/x
  3. Step 3: Cross multiply
    197.99x = 273.27 × 128.13
  4. Step 4: Simplify right side
    197.99x = 35,013.54
  5. Step 5: Solve for x
    x = 35,013.54/197.99
  6. Step 6: Final answer
    x = 176.85

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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.