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Finding the Fourth Proportional to 8,638.68, 12,964.94 and 4,479.88

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Solution

The fourth proportional to 8,638.68, 12,964.94 and 4,479.88 is: 6,723.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.68 : 12,964.94 = 4,479.88 : x
  2. Step 2: Convert to fraction form
    8,638.68/12,964.94 = 4,479.88/x
  3. Step 3: Cross multiply
    8,638.68x = 12,964.94 × 4,479.88
  4. Step 4: Simplify right side
    8,638.68x = 58,081,375.41
  5. Step 5: Solve for x
    x = 58,081,375.41/8,638.68
  6. Step 6: Final answer
    x = 6,723.41

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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.