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Finding the Fourth Proportional to 198.66, 298.11 and 83.09

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Solution

The fourth proportional to 198.66, 298.11 and 83.09 is: 124.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.66 : 298.11 = 83.09 : x
  2. Step 2: Convert to fraction form
    198.66/298.11 = 83.09/x
  3. Step 3: Cross multiply
    198.66x = 298.11 × 83.09
  4. Step 4: Simplify right side
    198.66x = 24,769.96
  5. Step 5: Solve for x
    x = 24,769.96/198.66
  6. Step 6: Final answer
    x = 124.69

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Why These Related Problems?

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