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Finding the Fourth Proportional to 8,657.74, 12,979.32 and 3,460.78

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Solution

The fourth proportional to 8,657.74, 12,979.32 and 3,460.78 is: 5,188.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,657.74 : 12,979.32 = 3,460.78 : x
  2. Step 2: Convert to fraction form
    8,657.74/12,979.32 = 3,460.78/x
  3. Step 3: Cross multiply
    8,657.74x = 12,979.32 × 3,460.78
  4. Step 4: Simplify right side
    8,657.74x = 44,918,571.07
  5. Step 5: Solve for x
    x = 44,918,571.07/8,657.74
  6. Step 6: Final answer
    x = 5,188.26

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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.