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Finding the Fourth Proportional to 198.81, 298.21 and 61.87

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Solution

The fourth proportional to 198.81, 298.21 and 61.87 is: 92.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.81 : 298.21 = 61.87 : x
  2. Step 2: Convert to fraction form
    198.81/298.21 = 61.87/x
  3. Step 3: Cross multiply
    198.81x = 298.21 × 61.87
  4. Step 4: Simplify right side
    198.81x = 18,450.25
  5. Step 5: Solve for x
    x = 18,450.25/198.81
  6. Step 6: Final answer
    x = 92.80

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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.