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Finding the Fourth Proportional to 122.21, 168.63 and 73.09

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Solution

The fourth proportional to 122.21, 168.63 and 73.09 is: 100.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.21 : 168.63 = 73.09 : x
  2. Step 2: Convert to fraction form
    122.21/168.63 = 73.09/x
  3. Step 3: Cross multiply
    122.21x = 168.63 × 73.09
  4. Step 4: Simplify right side
    122.21x = 12,324.32
  5. Step 5: Solve for x
    x = 12,324.32/122.21
  6. Step 6: Final answer
    x = 100.85

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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.