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Finding the Fourth Proportional to 122.69, 169.27 and 69.51

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Solution

The fourth proportional to 122.69, 169.27 and 69.51 is: 95.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.69 : 169.27 = 69.51 : x
  2. Step 2: Convert to fraction form
    122.69/169.27 = 69.51/x
  3. Step 3: Cross multiply
    122.69x = 169.27 × 69.51
  4. Step 4: Simplify right side
    122.69x = 11,765.78
  5. Step 5: Solve for x
    x = 11,765.78/122.69
  6. Step 6: Final answer
    x = 95.90

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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.