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Finding the Fourth Proportional to 122.08, 168.24 and 83.20

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Solution

The fourth proportional to 122.08, 168.24 and 83.20 is: 114.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.08 : 168.24 = 83.20 : x
  2. Step 2: Convert to fraction form
    122.08/168.24 = 83.20/x
  3. Step 3: Cross multiply
    122.08x = 168.24 × 83.20
  4. Step 4: Simplify right side
    122.08x = 13,997.57
  5. Step 5: Solve for x
    x = 13,997.57/122.08
  6. Step 6: Final answer
    x = 114.66

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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.