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Finding the Fourth Proportional to 681,339.78, 940,040.76 and 394,804.50

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Solution

The fourth proportional to 681,339.78, 940,040.76 and 394,804.50 is: 544,709.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,339.78 : 940,040.76 = 394,804.50 : x
  2. Step 2: Convert to fraction form
    681,339.78/940,040.76 = 394,804.50/x
  3. Step 3: Cross multiply
    681,339.78x = 940,040.76 × 394,804.50
  4. Step 4: Simplify right side
    681,339.78x = 371,132,322,231.42
  5. Step 5: Solve for x
    x = 371,132,322,231.42/681,339.78
  6. Step 6: Final answer
    x = 544,709.60

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Double scale
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Similar ratio
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1.5x scale

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.