Home / 3,939.84-5,436.80-2,171.40

Finding the Fourth Proportional to 3,939.84, 5,436.80 and 2,171.40

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Solution

The fourth proportional to 3,939.84, 5,436.80 and 2,171.40 is: 2,996.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.84 : 5,436.80 = 2,171.40 : x
  2. Step 2: Convert to fraction form
    3,939.84/5,436.80 = 2,171.40/x
  3. Step 3: Cross multiply
    3,939.84x = 5,436.80 × 2,171.40
  4. Step 4: Simplify right side
    3,939.84x = 11,805,467.52
  5. Step 5: Solve for x
    x = 11,805,467.52/3,939.84
  6. Step 6: Final answer
    x = 2,996.43

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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.