Home / 3,991.20-5,979.60-3,256.80

Finding the Fourth Proportional to 3,991.20, 5,979.60 and 3,256.80

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Solution

The fourth proportional to 3,991.20, 5,979.60 and 3,256.80 is: 4,879.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.20 : 5,979.60 = 3,256.80 : x
  2. Step 2: Convert to fraction form
    3,991.20/5,979.60 = 3,256.80/x
  3. Step 3: Cross multiply
    3,991.20x = 5,979.60 × 3,256.80
  4. Step 4: Simplify right side
    3,991.20x = 19,474,361.28
  5. Step 5: Solve for x
    x = 19,474,361.28/3,991.20
  6. Step 6: Final answer
    x = 4,879.32

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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.