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Finding the Fourth Proportional to 8,205.80, 12,306.30 and 2,940.20

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Solution

The fourth proportional to 8,205.80, 12,306.30 and 2,940.20 is: 4,409.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,205.80 : 12,306.30 = 2,940.20 : x
  2. Step 2: Convert to fraction form
    8,205.80/12,306.30 = 2,940.20/x
  3. Step 3: Cross multiply
    8,205.80x = 12,306.30 × 2,940.20
  4. Step 4: Simplify right side
    8,205.80x = 36,182,983.26
  5. Step 5: Solve for x
    x = 36,182,983.26/8,205.80
  6. Step 6: Final answer
    x = 4,409.44

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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.