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Finding the Fourth Proportional to 636,387.78, 878,348.70 and 403,664.25

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Solution

The fourth proportional to 636,387.78, 878,348.70 and 403,664.25 is: 557,141.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,387.78 : 878,348.70 = 403,664.25 : x
  2. Step 2: Convert to fraction form
    636,387.78/878,348.70 = 403,664.25/x
  3. Step 3: Cross multiply
    636,387.78x = 878,348.70 × 403,664.25
  4. Step 4: Simplify right side
    636,387.78x = 354,557,969,223.98
  5. Step 5: Solve for x
    x = 354,557,969,223.98/636,387.78
  6. Step 6: Final answer
    x = 557,141.39

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1.5x scale

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.