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Finding the Fourth Proportional to 221.30, 331.90 and 84.27

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Solution

The fourth proportional to 221.30, 331.90 and 84.27 is: 126.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.30 : 331.90 = 84.27 : x
  2. Step 2: Convert to fraction form
    221.30/331.90 = 84.27/x
  3. Step 3: Cross multiply
    221.30x = 331.90 × 84.27
  4. Step 4: Simplify right side
    221.30x = 27,970.25
  5. Step 5: Solve for x
    x = 27,970.25/221.30
  6. Step 6: Final answer
    x = 126.39

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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.