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Finding the Fourth Proportional to 8,620.47, 12,930.45 and 2,380.87

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Solution

The fourth proportional to 8,620.47, 12,930.45 and 2,380.87 is: 3,571.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620.47 : 12,930.45 = 2,380.87 : x
  2. Step 2: Convert to fraction form
    8,620.47/12,930.45 = 2,380.87/x
  3. Step 3: Cross multiply
    8,620.47x = 12,930.45 × 2,380.87
  4. Step 4: Simplify right side
    8,620.47x = 30,785,720.49
  5. Step 5: Solve for x
    x = 30,785,720.49/8,620.47
  6. Step 6: Final answer
    x = 3,571.23

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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.