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Finding the Fourth Proportional to 1,396,939.41, 1,928,303.04 and 816,351.05

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Solution

The fourth proportional to 1,396,939.41, 1,928,303.04 and 816,351.05 is: 1,126,872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396,939.41 : 1,928,303.04 = 816,351.05 : x
  2. Step 2: Convert to fraction form
    1,396,939.41/1,928,303.04 = 816,351.05/x
  3. Step 3: Cross multiply
    1,396,939.41x = 1,928,303.04 × 816,351.05
  4. Step 4: Simplify right side
    1,396,939.41x = 1,574,172,201,780.68
  5. Step 5: Solve for x
    x = 1,574,172,201,780.68/1,396,939.41
  6. Step 6: Final answer
    x = 1,126,872.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.