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Finding the Fourth Proportional to 8,608.65, 12,916.80 and 5,487.90

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Solution

The fourth proportional to 8,608.65, 12,916.80 and 5,487.90 is: 8,234.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,608.65 : 12,916.80 = 5,487.90 : x
  2. Step 2: Convert to fraction form
    8,608.65/12,916.80 = 5,487.90/x
  3. Step 3: Cross multiply
    8,608.65x = 12,916.80 × 5,487.90
  4. Step 4: Simplify right side
    8,608.65x = 70,886,106.72
  5. Step 5: Solve for x
    x = 70,886,106.72/8,608.65
  6. Step 6: Final answer
    x = 8,234.29

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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.