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Finding the Fourth Proportional to 198.34, 297.52 and 81.23

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Solution

The fourth proportional to 198.34, 297.52 and 81.23 is: 121.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.34 : 297.52 = 81.23 : x
  2. Step 2: Convert to fraction form
    198.34/297.52 = 81.23/x
  3. Step 3: Cross multiply
    198.34x = 297.52 × 81.23
  4. Step 4: Simplify right side
    198.34x = 24,165.86
  5. Step 5: Solve for x
    x = 24,165.86/198.34
  6. Step 6: Final answer
    x = 121.84

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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.