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Finding the Fourth Proportional to 122.25, 168.72 and 73.12

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Solution

The fourth proportional to 122.25, 168.72 and 73.12 is: 100.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.25 : 168.72 = 73.12 : x
  2. Step 2: Convert to fraction form
    122.25/168.72 = 73.12/x
  3. Step 3: Cross multiply
    122.25x = 168.72 × 73.12
  4. Step 4: Simplify right side
    122.25x = 12,336.81
  5. Step 5: Solve for x
    x = 12,336.81/122.25
  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.