Home / 3,939.40-5,436.30-2,170.96

Finding the Fourth Proportional to 3,939.40, 5,436.30 and 2,170.96

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Solution

The fourth proportional to 3,939.40, 5,436.30 and 2,170.96 is: 2,995.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.40 : 5,436.30 = 2,170.96 : x
  2. Step 2: Convert to fraction form
    3,939.40/5,436.30 = 2,170.96/x
  3. Step 3: Cross multiply
    3,939.40x = 5,436.30 × 2,170.96
  4. Step 4: Simplify right side
    3,939.40x = 11,801,989.85
  5. Step 5: Solve for x
    x = 11,801,989.85/3,939.40
  6. Step 6: Final answer
    x = 2,995.89

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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.