Home / 3,940.20-5,437.80-2,171.97

Finding the Fourth Proportional to 3,940.20, 5,437.80 and 2,171.97

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Solution

The fourth proportional to 3,940.20, 5,437.80 and 2,171.97 is: 2,997.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.20 : 5,437.80 = 2,171.97 : x
  2. Step 2: Convert to fraction form
    3,940.20/5,437.80 = 2,171.97/x
  3. Step 3: Cross multiply
    3,940.20x = 5,437.80 × 2,171.97
  4. Step 4: Simplify right side
    3,940.20x = 11,810,738.47
  5. Step 5: Solve for x
    x = 11,810,738.47/3,940.20
  6. Step 6: Final answer
    x = 2,997.50

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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.