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Finding the Fourth Proportional to 8,479.72, 12,719.58 and 3,865.96

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Solution

The fourth proportional to 8,479.72, 12,719.58 and 3,865.96 is: 5,798.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,479.72 : 12,719.58 = 3,865.96 : x
  2. Step 2: Convert to fraction form
    8,479.72/12,719.58 = 3,865.96/x
  3. Step 3: Cross multiply
    8,479.72x = 12,719.58 × 3,865.96
  4. Step 4: Simplify right side
    8,479.72x = 49,173,387.50
  5. Step 5: Solve for x
    x = 49,173,387.50/8,479.72
  6. Step 6: Final answer
    x = 5,798.94

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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.