Home / 3,939.78-5,436.47-2,171.28

Finding the Fourth Proportional to 3,939.78, 5,436.47 and 2,171.28

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Solution

The fourth proportional to 3,939.78, 5,436.47 and 2,171.28 is: 2,996.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.78 : 5,436.47 = 2,171.28 : x
  2. Step 2: Convert to fraction form
    3,939.78/5,436.47 = 2,171.28/x
  3. Step 3: Cross multiply
    3,939.78x = 5,436.47 × 2,171.28
  4. Step 4: Simplify right side
    3,939.78x = 11,804,087.73
  5. Step 5: Solve for x
    x = 11,804,087.73/3,939.78
  6. Step 6: Final answer
    x = 2,996.13

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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.