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Finding the Fourth Proportional to 221.20, 331.60 and 112.88

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Solution

The fourth proportional to 221.20, 331.60 and 112.88 is: 169.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.20 : 331.60 = 112.88 : x
  2. Step 2: Convert to fraction form
    221.20/331.60 = 112.88/x
  3. Step 3: Cross multiply
    221.20x = 331.60 × 112.88
  4. Step 4: Simplify right side
    221.20x = 37,431.01
  5. Step 5: Solve for x
    x = 37,431.01/221.20
  6. Step 6: Final answer
    x = 169.22

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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.