Home / 3,913.78-5,400.97-2,145.39

Finding the Fourth Proportional to 3,913.78, 5,400.97 and 2,145.39

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Solution

The fourth proportional to 3,913.78, 5,400.97 and 2,145.39 is: 2,960.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.78 : 5,400.97 = 2,145.39 : x
  2. Step 2: Convert to fraction form
    3,913.78/5,400.97 = 2,145.39/x
  3. Step 3: Cross multiply
    3,913.78x = 5,400.97 × 2,145.39
  4. Step 4: Simplify right side
    3,913.78x = 11,587,149.30
  5. Step 5: Solve for x
    x = 11,587,149.30/3,913.78
  6. Step 6: Final answer
    x = 2,960.60

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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.