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Finding the Fourth Proportional to 221.31, 331.99 and 84.39

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Solution

The fourth proportional to 221.31, 331.99 and 84.39 is: 126.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.31 : 331.99 = 84.39 : x
  2. Step 2: Convert to fraction form
    221.31/331.99 = 84.39/x
  3. Step 3: Cross multiply
    221.31x = 331.99 × 84.39
  4. Step 4: Simplify right side
    221.31x = 28,014.98
  5. Step 5: Solve for x
    x = 28,014.98/221.31
  6. Step 6: Final answer
    x = 126.59

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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.