Home / 3,906.28-5,390.68-2,138.05

Finding the Fourth Proportional to 3,906.28, 5,390.68 and 2,138.05

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Solution

The fourth proportional to 3,906.28, 5,390.68 and 2,138.05 is: 2,950.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.28 : 5,390.68 = 2,138.05 : x
  2. Step 2: Convert to fraction form
    3,906.28/5,390.68 = 2,138.05/x
  3. Step 3: Cross multiply
    3,906.28x = 5,390.68 × 2,138.05
  4. Step 4: Simplify right side
    3,906.28x = 11,525,512.44
  5. Step 5: Solve for x
    x = 11,525,512.44/3,906.28
  6. Step 6: Final answer
    x = 2,950.51

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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.