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Finding the Fourth Proportional to 198.76, 297.92 and 83.20

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Solution

The fourth proportional to 198.76, 297.92 and 83.20 is: 124.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.76 : 297.92 = 83.20 : x
  2. Step 2: Convert to fraction form
    198.76/297.92 = 83.20/x
  3. Step 3: Cross multiply
    198.76x = 297.92 × 83.20
  4. Step 4: Simplify right side
    198.76x = 24,786.94
  5. Step 5: Solve for x
    x = 24,786.94/198.76
  6. Step 6: Final answer
    x = 124.71

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.