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Finding the Fourth Proportional to 122.29, 168.70 and 73.15

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Solution

The fourth proportional to 122.29, 168.70 and 73.15 is: 100.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.29 : 168.70 = 73.15 : x
  2. Step 2: Convert to fraction form
    122.29/168.70 = 73.15/x
  3. Step 3: Cross multiply
    122.29x = 168.70 × 73.15
  4. Step 4: Simplify right side
    122.29x = 12,340.41
  5. Step 5: Solve for x
    x = 12,340.41/122.29
  6. Step 6: Final answer
    x = 100.91

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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.