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Finding the Fourth Proportional to 412,859.80, 619,289.70 and 398,425.60

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Solution

The fourth proportional to 412,859.80, 619,289.70 and 398,425.60 is: 597,638.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    412,859.80 : 619,289.70 = 398,425.60 : x
  2. Step 2: Convert to fraction form
    412,859.80/619,289.70 = 398,425.60/x
  3. Step 3: Cross multiply
    412,859.80x = 619,289.70 × 398,425.60
  4. Step 4: Simplify right side
    412,859.80x = 246,740,870,296.32
  5. Step 5: Solve for x
    x = 246,740,870,296.32/412,859.80
  6. Step 6: Final answer
    x = 597,638.40

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.