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Finding the Fourth Proportional to 8,579.78, 12,867.60 and 3,649.40

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Solution

The fourth proportional to 8,579.78, 12,867.60 and 3,649.40 is: 5,473.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,579.78 : 12,867.60 = 3,649.40 : x
  2. Step 2: Convert to fraction form
    8,579.78/12,867.60 = 3,649.40/x
  3. Step 3: Cross multiply
    8,579.78x = 12,867.60 × 3,649.40
  4. Step 4: Simplify right side
    8,579.78x = 46,959,019.44
  5. Step 5: Solve for x
    x = 46,959,019.44/8,579.78
  6. Step 6: Final answer
    x = 5,473.22

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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.