Home / 13,986.75-20,976.90-3,991.31

Finding the Fourth Proportional to 13,986.75, 20,976.90 and 3,991.31

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Solution

The fourth proportional to 13,986.75, 20,976.90 and 3,991.31 is: 5,986.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,986.75 : 20,976.90 = 3,991.31 : x
  2. Step 2: Convert to fraction form
    13,986.75/20,976.90 = 3,991.31/x
  3. Step 3: Cross multiply
    13,986.75x = 20,976.90 × 3,991.31
  4. Step 4: Simplify right side
    13,986.75x = 83,725,205.85
  5. Step 5: Solve for x
    x = 83,725,205.85/13,986.75
  6. Step 6: Final answer
    x = 5,986.04

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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.