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Finding the Fourth Proportional to 263,280.60, 394,920.90 and 85,805.55

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Solution

The fourth proportional to 263,280.60, 394,920.90 and 85,805.55 is: 128,708.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,280.60 : 394,920.90 = 85,805.55 : x
  2. Step 2: Convert to fraction form
    263,280.60/394,920.90 = 85,805.55/x
  3. Step 3: Cross multiply
    263,280.60x = 394,920.90 × 85,805.55
  4. Step 4: Simplify right side
    263,280.60x = 33,886,405,031.00
  5. Step 5: Solve for x
    x = 33,886,405,031.00/263,280.60
  6. Step 6: Final answer
    x = 128,708.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.