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Finding the Fourth Proportional to 122.72, 169.25 and 85.41

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Solution

The fourth proportional to 122.72, 169.25 and 85.41 is: 117.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.72 : 169.25 = 85.41 : x
  2. Step 2: Convert to fraction form
    122.72/169.25 = 85.41/x
  3. Step 3: Cross multiply
    122.72x = 169.25 × 85.41
  4. Step 4: Simplify right side
    122.72x = 14,455.22
  5. Step 5: Solve for x
    x = 14,455.22/122.72
  6. Step 6: Final answer
    x = 117.80

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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.