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Finding the Fourth Proportional to 221.38, 332.20 and 77.13

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Solution

The fourth proportional to 221.38, 332.20 and 77.13 is: 115.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.38 : 332.20 = 77.13 : x
  2. Step 2: Convert to fraction form
    221.38/332.20 = 77.13/x
  3. Step 3: Cross multiply
    221.38x = 332.20 × 77.13
  4. Step 4: Simplify right side
    221.38x = 25,622.59
  5. Step 5: Solve for x
    x = 25,622.59/221.38
  6. Step 6: Final answer
    x = 115.74

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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.