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Finding the Fourth Proportional to 221.39, 331.10 and 197.18

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Solution

The fourth proportional to 221.39, 331.10 and 197.18 is: 294.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.39 : 331.10 = 197.18 : x
  2. Step 2: Convert to fraction form
    221.39/331.10 = 197.18/x
  3. Step 3: Cross multiply
    221.39x = 331.10 × 197.18
  4. Step 4: Simplify right side
    221.39x = 65,286.30
  5. Step 5: Solve for x
    x = 65,286.30/221.39
  6. Step 6: Final answer
    x = 294.89

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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.