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Finding the Fourth Proportional to 8,139.78, 12,209.67 and 3,976.26

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Solution

The fourth proportional to 8,139.78, 12,209.67 and 3,976.26 is: 5,964.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.78 : 12,209.67 = 3,976.26 : x
  2. Step 2: Convert to fraction form
    8,139.78/12,209.67 = 3,976.26/x
  3. Step 3: Cross multiply
    8,139.78x = 12,209.67 × 3,976.26
  4. Step 4: Simplify right side
    8,139.78x = 48,548,822.43
  5. Step 5: Solve for x
    x = 48,548,822.43/8,139.78
  6. Step 6: Final answer
    x = 5,964.39

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Similar ratio
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1.5x scale

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.