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Finding the Fourth Proportional to 122.41, 168.73 and 103.78

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Solution

The fourth proportional to 122.41, 168.73 and 103.78 is: 143.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.41 : 168.73 = 103.78 : x
  2. Step 2: Convert to fraction form
    122.41/168.73 = 103.78/x
  3. Step 3: Cross multiply
    122.41x = 168.73 × 103.78
  4. Step 4: Simplify right side
    122.41x = 17,510.80
  5. Step 5: Solve for x
    x = 17,510.80/122.41
  6. Step 6: Final answer
    x = 143.05

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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.