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Finding the Fourth Proportional to 3,856.80, 5,781.83 and 2,620.20

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Solution

The fourth proportional to 3,856.80, 5,781.83 and 2,620.20 is: 3,928.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,856.80 : 5,781.83 = 2,620.20 : x
  2. Step 2: Convert to fraction form
    3,856.80/5,781.83 = 2,620.20/x
  3. Step 3: Cross multiply
    3,856.80x = 5,781.83 × 2,620.20
  4. Step 4: Simplify right side
    3,856.80x = 15,149,537.87
  5. Step 5: Solve for x
    x = 15,149,537.87/3,856.80
  6. Step 6: Final answer
    x = 3,928.01

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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.