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Finding the Fourth Proportional to 663,676.20, 995,514.30 and 398,255.40

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Solution

The fourth proportional to 663,676.20, 995,514.30 and 398,255.40 is: 597,383.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,676.20 : 995,514.30 = 398,255.40 : x
  2. Step 2: Convert to fraction form
    663,676.20/995,514.30 = 398,255.40/x
  3. Step 3: Cross multiply
    663,676.20x = 995,514.30 × 398,255.40
  4. Step 4: Simplify right side
    663,676.20x = 396,468,945,752.22
  5. Step 5: Solve for x
    x = 396,468,945,752.22/663,676.20
  6. Step 6: Final answer
    x = 597,383.10

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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.