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Finding the Fourth Proportional to 685,215.52, 945,698.75 and 394,771.78

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Solution

The fourth proportional to 685,215.52, 945,698.75 and 394,771.78 is: 544,843.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,215.52 : 945,698.75 = 394,771.78 : x
  2. Step 2: Convert to fraction form
    685,215.52/945,698.75 = 394,771.78/x
  3. Step 3: Cross multiply
    685,215.52x = 945,698.75 × 394,771.78
  4. Step 4: Simplify right side
    685,215.52x = 373,335,177,503.96
  5. Step 5: Solve for x
    x = 373,335,177,503.96/685,215.52
  6. Step 6: Final answer
    x = 544,843.44

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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.