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Finding the Fourth Proportional to 8,660.43, 12,990.61 and 2,086.60

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Solution

The fourth proportional to 8,660.43, 12,990.61 and 2,086.60 is: 3,129.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,660.43 : 12,990.61 = 2,086.60 : x
  2. Step 2: Convert to fraction form
    8,660.43/12,990.61 = 2,086.60/x
  3. Step 3: Cross multiply
    8,660.43x = 12,990.61 × 2,086.60
  4. Step 4: Simplify right side
    8,660.43x = 27,106,206.83
  5. Step 5: Solve for x
    x = 27,106,206.83/8,660.43
  6. Step 6: Final answer
    x = 3,129.89

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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.