Home / 3,913.27-5,400.38-2,120.78

Finding the Fourth Proportional to 3,913.27, 5,400.38 and 2,120.78

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Solution

The fourth proportional to 3,913.27, 5,400.38 and 2,120.78 is: 2,926.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.27 : 5,400.38 = 2,120.78 : x
  2. Step 2: Convert to fraction form
    3,913.27/5,400.38 = 2,120.78/x
  3. Step 3: Cross multiply
    3,913.27x = 5,400.38 × 2,120.78
  4. Step 4: Simplify right side
    3,913.27x = 11,453,017.90
  5. Step 5: Solve for x
    x = 11,453,017.90/3,913.27
  6. Step 6: Final answer
    x = 2,926.71

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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.