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Finding the Fourth Proportional to 8,608.90, 12,880.70 and 5,100.78

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Solution

The fourth proportional to 8,608.90, 12,880.70 and 5,100.78 is: 7,631.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,608.90 : 12,880.70 = 5,100.78 : x
  2. Step 2: Convert to fraction form
    8,608.90/12,880.70 = 5,100.78/x
  3. Step 3: Cross multiply
    8,608.90x = 12,880.70 × 5,100.78
  4. Step 4: Simplify right side
    8,608.90x = 65,701,616.95
  5. Step 5: Solve for x
    x = 65,701,616.95/8,608.90
  6. Step 6: Final answer
    x = 7,631.82

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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.