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Finding the Fourth Proportional to 1,396,943.41, 1,928,308.56 and 816,355.05

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Solution

The fourth proportional to 1,396,943.41, 1,928,308.56 and 816,355.05 is: 1,126,877.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396,943.41 : 1,928,308.56 = 816,355.05 : x
  2. Step 2: Convert to fraction form
    1,396,943.41/1,928,308.56 = 816,355.05/x
  3. Step 3: Cross multiply
    1,396,943.41x = 1,928,308.56 × 816,355.05
  4. Step 4: Simplify right side
    1,396,943.41x = 1,574,184,430,914.23
  5. Step 5: Solve for x
    x = 1,574,184,430,914.23/1,396,943.41
  6. Step 6: Final answer
    x = 1,126,877.74

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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.