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Finding the Fourth Proportional to 198.16, 297.32 and 129.84

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Solution

The fourth proportional to 198.16, 297.32 and 129.84 is: 194.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.16 : 297.32 = 129.84 : x
  2. Step 2: Convert to fraction form
    198.16/297.32 = 129.84/x
  3. Step 3: Cross multiply
    198.16x = 297.32 × 129.84
  4. Step 4: Simplify right side
    198.16x = 38,604.03
  5. Step 5: Solve for x
    x = 38,604.03/198.16
  6. Step 6: Final answer
    x = 194.81

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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.