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Finding the Fourth Proportional to 663,670.20, 995,505.30 and 398,249.40

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Solution

The fourth proportional to 663,670.20, 995,505.30 and 398,249.40 is: 597,374.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,670.20 : 995,505.30 = 398,249.40 : x
  2. Step 2: Convert to fraction form
    663,670.20/995,505.30 = 398,249.40/x
  3. Step 3: Cross multiply
    663,670.20x = 995,505.30 × 398,249.40
  4. Step 4: Simplify right side
    663,670.20x = 396,459,388,421.82
  5. Step 5: Solve for x
    x = 396,459,388,421.82/663,670.20
  6. Step 6: Final answer
    x = 597,374.10

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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.