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Finding the Fourth Proportional to 198.88, 298.14 and 107.68

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Solution

The fourth proportional to 198.88, 298.14 and 107.68 is: 161.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.88 : 298.14 = 107.68 : x
  2. Step 2: Convert to fraction form
    198.88/298.14 = 107.68/x
  3. Step 3: Cross multiply
    198.88x = 298.14 × 107.68
  4. Step 4: Simplify right side
    198.88x = 32,103.72
  5. Step 5: Solve for x
    x = 32,103.72/198.88
  6. Step 6: Final answer
    x = 161.42

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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.