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Finding the Fourth Proportional to 122.57, 169.20 and 85.73

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Solution

The fourth proportional to 122.57, 169.20 and 85.73 is: 118.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.57 : 169.20 = 85.73 : x
  2. Step 2: Convert to fraction form
    122.57/169.20 = 85.73/x
  3. Step 3: Cross multiply
    122.57x = 169.20 × 85.73
  4. Step 4: Simplify right side
    122.57x = 14,505.52
  5. Step 5: Solve for x
    x = 14,505.52/122.57
  6. Step 6: Final answer
    x = 118.34

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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.