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Finding the Fourth Proportional to 8,720.60, 13,078.59 and 3,789.08

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Solution

The fourth proportional to 8,720.60, 13,078.59 and 3,789.08 is: 5,682.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.60 : 13,078.59 = 3,789.08 : x
  2. Step 2: Convert to fraction form
    8,720.60/13,078.59 = 3,789.08/x
  3. Step 3: Cross multiply
    8,720.60x = 13,078.59 × 3,789.08
  4. Step 4: Simplify right side
    8,720.60x = 49,555,856.49
  5. Step 5: Solve for x
    x = 49,555,856.49/8,720.60
  6. Step 6: Final answer
    x = 5,682.62

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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.