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Finding the Fourth Proportional to 67,168.40, 100,734.60 and 20,408.72

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Solution

The fourth proportional to 67,168.40, 100,734.60 and 20,408.72 is: 30,607.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,168.40 : 100,734.60 = 20,408.72 : x
  2. Step 2: Convert to fraction form
    67,168.40/100,734.60 = 20,408.72/x
  3. Step 3: Cross multiply
    67,168.40x = 100,734.60 × 20,408.72
  4. Step 4: Simplify right side
    67,168.40x = 2,055,864,245.71
  5. Step 5: Solve for x
    x = 2,055,864,245.71/67,168.40
  6. Step 6: Final answer
    x = 30,607.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.