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Finding the Fourth Proportional to 8,235.96, 12,355.90 and 2,689.31

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Solution

The fourth proportional to 8,235.96, 12,355.90 and 2,689.31 is: 4,034.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,235.96 : 12,355.90 = 2,689.31 : x
  2. Step 2: Convert to fraction form
    8,235.96/12,355.90 = 2,689.31/x
  3. Step 3: Cross multiply
    8,235.96x = 12,355.90 × 2,689.31
  4. Step 4: Simplify right side
    8,235.96x = 33,228,845.43
  5. Step 5: Solve for x
    x = 33,228,845.43/8,235.96
  6. Step 6: Final answer
    x = 4,034.61

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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.