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Finding the Fourth Proportional to 122.20, 168.58 and 80.77

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Solution

The fourth proportional to 122.20, 168.58 and 80.77 is: 111.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.20 : 168.58 = 80.77 : x
  2. Step 2: Convert to fraction form
    122.20/168.58 = 80.77/x
  3. Step 3: Cross multiply
    122.20x = 168.58 × 80.77
  4. Step 4: Simplify right side
    122.20x = 13,616.21
  5. Step 5: Solve for x
    x = 13,616.21/122.20
  6. Step 6: Final answer
    x = 111.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.