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Finding the Fourth Proportional to 122.53, 169.09 and 67.28

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Solution

The fourth proportional to 122.53, 169.09 and 67.28 is: 92.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.53 : 169.09 = 67.28 : x
  2. Step 2: Convert to fraction form
    122.53/169.09 = 67.28/x
  3. Step 3: Cross multiply
    122.53x = 169.09 × 67.28
  4. Step 4: Simplify right side
    122.53x = 11,375.19
  5. Step 5: Solve for x
    x = 11,375.19/122.53
  6. Step 6: Final answer
    x = 92.84

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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.