Home / 8,078.19-12,120.83-3,921.39

Finding the Fourth Proportional to 8,078.19, 12,120.83 and 3,921.39

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Solution

The fourth proportional to 8,078.19, 12,120.83 and 3,921.39 is: 5,883.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,078.19 : 12,120.83 = 3,921.39 : x
  2. Step 2: Convert to fraction form
    8,078.19/12,120.83 = 3,921.39/x
  3. Step 3: Cross multiply
    8,078.19x = 12,120.83 × 3,921.39
  4. Step 4: Simplify right side
    8,078.19x = 47,530,481.95
  5. Step 5: Solve for x
    x = 47,530,481.95/8,078.19
  6. Step 6: Final answer
    x = 5,883.80

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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.