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Finding the Fourth Proportional to 122.70, 169.26 and 104.28

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Solution

The fourth proportional to 122.70, 169.26 and 104.28 is: 143.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.70 : 169.26 = 104.28 : x
  2. Step 2: Convert to fraction form
    122.70/169.26 = 104.28/x
  3. Step 3: Cross multiply
    122.70x = 169.26 × 104.28
  4. Step 4: Simplify right side
    122.70x = 17,650.43
  5. Step 5: Solve for x
    x = 17,650.43/122.70
  6. Step 6: Final answer
    x = 143.85

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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.