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Finding the Fourth Proportional to 678,259.80, 936,042.78 and 391,791.96

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Solution

The fourth proportional to 678,259.80, 936,042.78 and 391,791.96 is: 540,698.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,259.80 : 936,042.78 = 391,791.96 : x
  2. Step 2: Convert to fraction form
    678,259.80/936,042.78 = 391,791.96/x
  3. Step 3: Cross multiply
    678,259.80x = 936,042.78 × 391,791.96
  4. Step 4: Simplify right side
    678,259.80x = 366,734,035,420.05
  5. Step 5: Solve for x
    x = 366,734,035,420.05/678,259.80
  6. Step 6: Final answer
    x = 540,698.47

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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.