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Finding the Fourth Proportional to 8,561.92, 12,781.52 and 8,183.68

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Solution

The fourth proportional to 8,561.92, 12,781.52 and 8,183.68 is: 12,216.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,561.92 : 12,781.52 = 8,183.68 : x
  2. Step 2: Convert to fraction form
    8,561.92/12,781.52 = 8,183.68/x
  3. Step 3: Cross multiply
    8,561.92x = 12,781.52 × 8,183.68
  4. Step 4: Simplify right side
    8,561.92x = 104,599,869.59
  5. Step 5: Solve for x
    x = 104,599,869.59/8,561.92
  6. Step 6: Final answer
    x = 12,216.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.