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Finding the Fourth Proportional to 221.37, 331.78 and 76.92

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Solution

The fourth proportional to 221.37, 331.78 and 76.92 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.37 : 331.78 = 76.92 : x
  2. Step 2: Convert to fraction form
    221.37/331.78 = 76.92/x
  3. Step 3: Cross multiply
    221.37x = 331.78 × 76.92
  4. Step 4: Simplify right side
    221.37x = 25,520.52
  5. Step 5: Solve for x
    x = 25,520.52/221.37
  6. Step 6: Final answer
    x = 115.28

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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.