Home / 3,979.80-5,969.94-1,382.40

Finding the Fourth Proportional to 3,979.80, 5,969.94 and 1,382.40

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Solution

The fourth proportional to 3,979.80, 5,969.94 and 1,382.40 is: 2,073.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.80 : 5,969.94 = 1,382.40 : x
  2. Step 2: Convert to fraction form
    3,979.80/5,969.94 = 1,382.40/x
  3. Step 3: Cross multiply
    3,979.80x = 5,969.94 × 1,382.40
  4. Step 4: Simplify right side
    3,979.80x = 8,252,845.06
  5. Step 5: Solve for x
    x = 8,252,845.06/3,979.80
  6. Step 6: Final answer
    x = 2,073.68

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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.