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Finding the Fourth Proportional to 8,608.40, 12,916.20 and 2,766.80

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Solution

The fourth proportional to 8,608.40, 12,916.20 and 2,766.80 is: 4,151.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,608.40 : 12,916.20 = 2,766.80 : x
  2. Step 2: Convert to fraction form
    8,608.40/12,916.20 = 2,766.80/x
  3. Step 3: Cross multiply
    8,608.40x = 12,916.20 × 2,766.80
  4. Step 4: Simplify right side
    8,608.40x = 35,736,542.16
  5. Step 5: Solve for x
    x = 35,736,542.16/8,608.40
  6. Step 6: Final answer
    x = 4,151.36

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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.