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Finding the Fourth Proportional to 122.42, 168.85 and 85.62

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Solution

The fourth proportional to 122.42, 168.85 and 85.62 is: 118.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.42 : 168.85 = 85.62 : x
  2. Step 2: Convert to fraction form
    122.42/168.85 = 85.62/x
  3. Step 3: Cross multiply
    122.42x = 168.85 × 85.62
  4. Step 4: Simplify right side
    122.42x = 14,456.94
  5. Step 5: Solve for x
    x = 14,456.94/122.42
  6. Step 6: Final answer
    x = 118.09

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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.