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Finding the Fourth Proportional to 3,979.81, 5,969.78 and 2,223.80

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Solution

The fourth proportional to 3,979.81, 5,969.78 and 2,223.80 is: 3,335.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.81 : 5,969.78 = 2,223.80 : x
  2. Step 2: Convert to fraction form
    3,979.81/5,969.78 = 2,223.80/x
  3. Step 3: Cross multiply
    3,979.81x = 5,969.78 × 2,223.80
  4. Step 4: Simplify right side
    3,979.81x = 13,275,555.80
  5. Step 5: Solve for x
    x = 13,275,555.80/3,979.81
  6. Step 6: Final answer
    x = 3,335.73

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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.