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Finding the Fourth Proportional to 8,578.78, 12,864.06 and 4,191.10

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Solution

The fourth proportional to 8,578.78, 12,864.06 and 4,191.10 is: 6,284.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,578.78 : 12,864.06 = 4,191.10 : x
  2. Step 2: Convert to fraction form
    8,578.78/12,864.06 = 4,191.10/x
  3. Step 3: Cross multiply
    8,578.78x = 12,864.06 × 4,191.10
  4. Step 4: Simplify right side
    8,578.78x = 53,914,561.87
  5. Step 5: Solve for x
    x = 53,914,561.87/8,578.78
  6. Step 6: Final answer
    x = 6,284.64

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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.