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Finding the Fourth Proportional to 122.43, 168.97 and 72.63

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Solution

The fourth proportional to 122.43, 168.97 and 72.63 is: 100.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.43 : 168.97 = 72.63 : x
  2. Step 2: Convert to fraction form
    122.43/168.97 = 72.63/x
  3. Step 3: Cross multiply
    122.43x = 168.97 × 72.63
  4. Step 4: Simplify right side
    122.43x = 12,272.29
  5. Step 5: Solve for x
    x = 12,272.29/122.43
  6. Step 6: Final answer
    x = 100.24

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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.