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Finding the Fourth Proportional to 122.67, 168.21 and 116.55

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Solution

The fourth proportional to 122.67, 168.21 and 116.55 is: 159.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.67 : 168.21 = 116.55 : x
  2. Step 2: Convert to fraction form
    122.67/168.21 = 116.55/x
  3. Step 3: Cross multiply
    122.67x = 168.21 × 116.55
  4. Step 4: Simplify right side
    122.67x = 19,604.88
  5. Step 5: Solve for x
    x = 19,604.88/122.67
  6. Step 6: Final answer
    x = 159.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.