Home / 3,939.79-5,436.97-2,171.28

Finding the Fourth Proportional to 3,939.79, 5,436.97 and 2,171.28

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Solution

The fourth proportional to 3,939.79, 5,436.97 and 2,171.28 is: 2,996.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.79 : 5,436.97 = 2,171.28 : x
  2. Step 2: Convert to fraction form
    3,939.79/5,436.97 = 2,171.28/x
  3. Step 3: Cross multiply
    3,939.79x = 5,436.97 × 2,171.28
  4. Step 4: Simplify right side
    3,939.79x = 11,805,196.10
  5. Step 5: Solve for x
    x = 11,805,196.10/3,939.79
  6. Step 6: Final answer
    x = 2,996.40

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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.