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Finding the Fourth Proportional to 668,878.92, 922,992 and 396,900

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Solution

The fourth proportional to 668,878.92, 922,992 and 396,900 is: 547,685.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    668,878.92 : 922,992 = 396,900 : x
  2. Step 2: Convert to fraction form
    668,878.92/922,992 = 396,900/x
  3. Step 3: Cross multiply
    668,878.92x = 922,992 × 396,900
  4. Step 4: Simplify right side
    668,878.92x = 366,335,524,800
  5. Step 5: Solve for x
    x = 366,335,524,800/668,878.92
  6. Step 6: Final answer
    x = 547,685.86

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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.