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Finding the Fourth Proportional to 122.90, 169.38 and 85.97

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Solution

The fourth proportional to 122.90, 169.38 and 85.97 is: 118.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.90 : 169.38 = 85.97 : x
  2. Step 2: Convert to fraction form
    122.90/169.38 = 85.97/x
  3. Step 3: Cross multiply
    122.90x = 169.38 × 85.97
  4. Step 4: Simplify right side
    122.90x = 14,560.75
  5. Step 5: Solve for x
    x = 14,560.75/122.90
  6. Step 6: Final answer
    x = 118.48

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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.