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Finding the Fourth Proportional to 1,383,979.80, 1,909,848.78 and 811,401.30

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Solution

The fourth proportional to 1,383,979.80, 1,909,848.78 and 811,401.30 is: 1,119,708.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383,979.80 : 1,909,848.78 = 811,401.30 : x
  2. Step 2: Convert to fraction form
    1,383,979.80/1,909,848.78 = 811,401.30/x
  3. Step 3: Cross multiply
    1,383,979.80x = 1,909,848.78 × 811,401.30
  4. Step 4: Simplify right side
    1,383,979.80x = 1,549,653,782,895.41
  5. Step 5: Solve for x
    x = 1,549,653,782,895.41/1,383,979.80
  6. Step 6: Final answer
    x = 1,119,708.38

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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.