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Finding the Fourth Proportional to 685,218.52, 945,702.89 and 394,774.78

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Solution

The fourth proportional to 685,218.52, 945,702.89 and 394,774.78 is: 544,847.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,218.52 : 945,702.89 = 394,774.78 : x
  2. Step 2: Convert to fraction form
    685,218.52/945,702.89 = 394,774.78/x
  3. Step 3: Cross multiply
    685,218.52x = 945,702.89 × 394,774.78
  4. Step 4: Simplify right side
    685,218.52x = 373,339,650,345.11
  5. Step 5: Solve for x
    x = 373,339,650,345.11/685,218.52
  6. Step 6: Final answer
    x = 544,847.58

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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.