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Finding the Fourth Proportional to 8,205.80, 12,308.70 and 3,821.80

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Solution

The fourth proportional to 8,205.80, 12,308.70 and 3,821.80 is: 5,732.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,205.80 : 12,308.70 = 3,821.80 : x
  2. Step 2: Convert to fraction form
    8,205.80/12,308.70 = 3,821.80/x
  3. Step 3: Cross multiply
    8,205.80x = 12,308.70 × 3,821.80
  4. Step 4: Simplify right side
    8,205.80x = 47,041,389.66
  5. Step 5: Solve for x
    x = 47,041,389.66/8,205.80
  6. Step 6: Final answer
    x = 5,732.70

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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.