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Finding the Fourth Proportional to 8,722.80, 13,080.15 and 3,789.90

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Solution

The fourth proportional to 8,722.80, 13,080.15 and 3,789.90 is: 5,683.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,722.80 : 13,080.15 = 3,789.90 : x
  2. Step 2: Convert to fraction form
    8,722.80/13,080.15 = 3,789.90/x
  3. Step 3: Cross multiply
    8,722.80x = 13,080.15 × 3,789.90
  4. Step 4: Simplify right side
    8,722.80x = 49,572,460.49
  5. Step 5: Solve for x
    x = 49,572,460.49/8,722.80
  6. Step 6: Final answer
    x = 5,683.09

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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.