Home / 3,988.12-5,982.20-1,391.06

Finding the Fourth Proportional to 3,988.12, 5,982.20 and 1,391.06

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Solution

The fourth proportional to 3,988.12, 5,982.20 and 1,391.06 is: 2,086.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.12 : 5,982.20 = 1,391.06 : x
  2. Step 2: Convert to fraction form
    3,988.12/5,982.20 = 1,391.06/x
  3. Step 3: Cross multiply
    3,988.12x = 5,982.20 × 1,391.06
  4. Step 4: Simplify right side
    3,988.12x = 8,321,562.27
  5. Step 5: Solve for x
    x = 8,321,562.27/3,988.12
  6. Step 6: Final answer
    x = 2,086.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.