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Finding the Fourth Proportional to 221.10, 331.39 and 123.55

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Solution

The fourth proportional to 221.10, 331.39 and 123.55 is: 185.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.10 : 331.39 = 123.55 : x
  2. Step 2: Convert to fraction form
    221.10/331.39 = 123.55/x
  3. Step 3: Cross multiply
    221.10x = 331.39 × 123.55
  4. Step 4: Simplify right side
    221.10x = 40,942.56
  5. Step 5: Solve for x
    x = 40,942.56/221.10
  6. Step 6: Final answer
    x = 185.18

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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.