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Finding the Fourth Proportional to 221.37, 331.86 and 84.34

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Solution

The fourth proportional to 221.37, 331.86 and 84.34 is: 126.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.37 : 331.86 = 84.34 : x
  2. Step 2: Convert to fraction form
    221.37/331.86 = 84.34/x
  3. Step 3: Cross multiply
    221.37x = 331.86 × 84.34
  4. Step 4: Simplify right side
    221.37x = 27,989.07
  5. Step 5: Solve for x
    x = 27,989.07/221.37
  6. Step 6: Final answer
    x = 126.44

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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.