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Finding the Fourth Proportional to 198.24, 273.19 and 142.88

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Solution

The fourth proportional to 198.24, 273.19 and 142.88 is: 196.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.24 : 273.19 = 142.88 : x
  2. Step 2: Convert to fraction form
    198.24/273.19 = 142.88/x
  3. Step 3: Cross multiply
    198.24x = 273.19 × 142.88
  4. Step 4: Simplify right side
    198.24x = 39,031.31
  5. Step 5: Solve for x
    x = 39,031.31/198.24
  6. Step 6: Final answer
    x = 196.89

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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.