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Finding the Fourth Proportional to 636,687, 878,628.60 and 368,415

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Solution

The fourth proportional to 636,687, 878,628.60 and 368,415 is: 508,413.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,687 : 878,628.60 = 368,415 : x
  2. Step 2: Convert to fraction form
    636,687/878,628.60 = 368,415/x
  3. Step 3: Cross multiply
    636,687x = 878,628.60 × 368,415
  4. Step 4: Simplify right side
    636,687x = 323,699,955,669
  5. Step 5: Solve for x
    x = 323,699,955,669/636,687
  6. Step 6: Final answer
    x = 508,413.01

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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.