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Finding the Fourth Proportional to 20,425.22, 30,640.43 and 7,278.92

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Solution

The fourth proportional to 20,425.22, 30,640.43 and 7,278.92 is: 10,919.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,425.22 : 30,640.43 = 7,278.92 : x
  2. Step 2: Convert to fraction form
    20,425.22/30,640.43 = 7,278.92/x
  3. Step 3: Cross multiply
    20,425.22x = 30,640.43 × 7,278.92
  4. Step 4: Simplify right side
    20,425.22x = 223,029,103.73
  5. Step 5: Solve for x
    x = 223,029,103.73/20,425.22
  6. Step 6: Final answer
    x = 10,919.30

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1.5x scale

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.