Home / 3,939.45-5,436.40-2,171.05

Finding the Fourth Proportional to 3,939.45, 5,436.40 and 2,171.05

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Solution

The fourth proportional to 3,939.45, 5,436.40 and 2,171.05 is: 2,996.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.45 : 5,436.40 = 2,171.05 : x
  2. Step 2: Convert to fraction form
    3,939.45/5,436.40 = 2,171.05/x
  3. Step 3: Cross multiply
    3,939.45x = 5,436.40 × 2,171.05
  4. Step 4: Simplify right side
    3,939.45x = 11,802,721.01
  5. Step 5: Solve for x
    x = 11,802,721.01/3,939.45
  6. Step 6: Final answer
    x = 2,996.03

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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.