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Finding the Fourth Proportional to 221.25, 331.88 and 69.25

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Solution

The fourth proportional to 221.25, 331.88 and 69.25 is: 103.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.25 : 331.88 = 69.25 : x
  2. Step 2: Convert to fraction form
    221.25/331.88 = 69.25/x
  3. Step 3: Cross multiply
    221.25x = 331.88 × 69.25
  4. Step 4: Simplify right side
    221.25x = 22,982.34
  5. Step 5: Solve for x
    x = 22,982.34/221.25
  6. Step 6: Final answer
    x = 103.88

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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.