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Finding the Fourth Proportional to 636,326.71, 878,413.94 and 378,287.21

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Solution

The fourth proportional to 636,326.71, 878,413.94 and 378,287.21 is: 522,204.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,326.71 : 878,413.94 = 378,287.21 : x
  2. Step 2: Convert to fraction form
    636,326.71/878,413.94 = 378,287.21/x
  3. Step 3: Cross multiply
    636,326.71x = 878,413.94 × 378,287.21
  4. Step 4: Simplify right side
    636,326.71x = 332,292,761,374.82
  5. Step 5: Solve for x
    x = 332,292,761,374.82/636,326.71
  6. Step 6: Final answer
    x = 522,204.64

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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.