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Finding the Fourth Proportional to 198.47, 273.75 and 136.21

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Solution

The fourth proportional to 198.47, 273.75 and 136.21 is: 187.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.47 : 273.75 = 136.21 : x
  2. Step 2: Convert to fraction form
    198.47/273.75 = 136.21/x
  3. Step 3: Cross multiply
    198.47x = 273.75 × 136.21
  4. Step 4: Simplify right side
    198.47x = 37,287.49
  5. Step 5: Solve for x
    x = 37,287.49/198.47
  6. Step 6: Final answer
    x = 187.87

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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.