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Finding the Fourth Proportional to 647,998.20, 971,997.30 and 396,055.80

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Solution

The fourth proportional to 647,998.20, 971,997.30 and 396,055.80 is: 594,083.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,998.20 : 971,997.30 = 396,055.80 : x
  2. Step 2: Convert to fraction form
    647,998.20/971,997.30 = 396,055.80/x
  3. Step 3: Cross multiply
    647,998.20x = 971,997.30 × 396,055.80
  4. Step 4: Simplify right side
    647,998.20x = 384,965,168,249.34
  5. Step 5: Solve for x
    x = 384,965,168,249.34/647,998.20
  6. Step 6: Final answer
    x = 594,083.70

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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.