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Finding the Fourth Proportional to 122.05, 168.42 and 84.66

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Solution

The fourth proportional to 122.05, 168.42 and 84.66 is: 116.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.05 : 168.42 = 84.66 : x
  2. Step 2: Convert to fraction form
    122.05/168.42 = 84.66/x
  3. Step 3: Cross multiply
    122.05x = 168.42 × 84.66
  4. Step 4: Simplify right side
    122.05x = 14,258.44
  5. Step 5: Solve for x
    x = 14,258.44/122.05
  6. Step 6: Final answer
    x = 116.82

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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.