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Finding the Fourth Proportional to 198.72, 273.97 and 143.28

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Solution

The fourth proportional to 198.72, 273.97 and 143.28 is: 197.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.72 : 273.97 = 143.28 : x
  2. Step 2: Convert to fraction form
    198.72/273.97 = 143.28/x
  3. Step 3: Cross multiply
    198.72x = 273.97 × 143.28
  4. Step 4: Simplify right side
    198.72x = 39,253.71
  5. Step 5: Solve for x
    x = 39,253.71/198.72
  6. Step 6: Final answer
    x = 197.54

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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.