Home / 1,991,112.78-2,986,414.92-643,135.32

Finding the Fourth Proportional to 1,991,112.78, 2,986,414.92 and 643,135.32

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Solution

The fourth proportional to 1,991,112.78, 2,986,414.92 and 643,135.32 is: 964,620.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991,112.78 : 2,986,414.92 = 643,135.32 : x
  2. Step 2: Convert to fraction form
    1,991,112.78/2,986,414.92 = 643,135.32/x
  3. Step 3: Cross multiply
    1,991,112.78x = 2,986,414.92 × 643,135.32
  4. Step 4: Simplify right side
    1,991,112.78x = 1,920,668,915,226.97
  5. Step 5: Solve for x
    x = 1,920,668,915,226.97/1,991,112.78
  6. Step 6: Final answer
    x = 964,620.86

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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.