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Finding the Fourth Proportional to 681,100, 939,917.76 and 394,786.08

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Solution

The fourth proportional to 681,100, 939,917.76 and 394,786.08 is: 544,804.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,100 : 939,917.76 = 394,786.08 : x
  2. Step 2: Convert to fraction form
    681,100/939,917.76 = 394,786.08/x
  3. Step 3: Cross multiply
    681,100x = 939,917.76 × 394,786.08
  4. Step 4: Simplify right side
    681,100x = 371,066,447,992.78
  5. Step 5: Solve for x
    x = 371,066,447,992.78/681,100
  6. Step 6: Final answer
    x = 544,804.65

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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.