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Finding the Fourth Proportional to 8,112.70, 12,169.05 and 2,918.98

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Solution

The fourth proportional to 8,112.70, 12,169.05 and 2,918.98 is: 4,378.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,112.70 : 12,169.05 = 2,918.98 : x
  2. Step 2: Convert to fraction form
    8,112.70/12,169.05 = 2,918.98/x
  3. Step 3: Cross multiply
    8,112.70x = 12,169.05 × 2,918.98
  4. Step 4: Simplify right side
    8,112.70x = 35,521,213.57
  5. Step 5: Solve for x
    x = 35,521,213.57/8,112.70
  6. Step 6: Final answer
    x = 4,378.47

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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.