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Finding the Fourth Proportional to 8,121, 12,181.90 and 2,649

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Solution

The fourth proportional to 8,121, 12,181.90 and 2,649 is: 3,973.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,121 : 12,181.90 = 2,649 : x
  2. Step 2: Convert to fraction form
    8,121/12,181.90 = 2,649/x
  3. Step 3: Cross multiply
    8,121x = 12,181.90 × 2,649
  4. Step 4: Simplify right side
    8,121x = 32,269,853.10
  5. Step 5: Solve for x
    x = 32,269,853.10/8,121
  6. Step 6: Final answer
    x = 3,973.63

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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.