Home / 3,912.62-5,399.39-2,120.09

Finding the Fourth Proportional to 3,912.62, 5,399.39 and 2,120.09

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Solution

The fourth proportional to 3,912.62, 5,399.39 and 2,120.09 is: 2,925.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.62 : 5,399.39 = 2,120.09 : x
  2. Step 2: Convert to fraction form
    3,912.62/5,399.39 = 2,120.09/x
  3. Step 3: Cross multiply
    3,912.62x = 5,399.39 × 2,120.09
  4. Step 4: Simplify right side
    3,912.62x = 11,447,155.15
  5. Step 5: Solve for x
    x = 11,447,155.15/3,912.62
  6. Step 6: Final answer
    x = 2,925.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.