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Finding the Fourth Proportional to 278,639.71, 417,959.55 and 68,275.82

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Solution

The fourth proportional to 278,639.71, 417,959.55 and 68,275.82 is: 102,413.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,639.71 : 417,959.55 = 68,275.82 : x
  2. Step 2: Convert to fraction form
    278,639.71/417,959.55 = 68,275.82/x
  3. Step 3: Cross multiply
    278,639.71x = 417,959.55 × 68,275.82
  4. Step 4: Simplify right side
    278,639.71x = 28,536,531,003.08
  5. Step 5: Solve for x
    x = 28,536,531,003.08/278,639.71
  6. Step 6: Final answer
    x = 102,413.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.