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Finding the Fourth Proportional to 8,561.70, 12,843.90 and 2,718.90

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Solution

The fourth proportional to 8,561.70, 12,843.90 and 2,718.90 is: 4,078.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,561.70 : 12,843.90 = 2,718.90 : x
  2. Step 2: Convert to fraction form
    8,561.70/12,843.90 = 2,718.90/x
  3. Step 3: Cross multiply
    8,561.70x = 12,843.90 × 2,718.90
  4. Step 4: Simplify right side
    8,561.70x = 34,921,279.71
  5. Step 5: Solve for x
    x = 34,921,279.71/8,561.70
  6. Step 6: Final answer
    x = 4,078.78

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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.