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Finding the Fourth Proportional to 664,555.20, 996,832.80 and 399,134.40

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Solution

The fourth proportional to 664,555.20, 996,832.80 and 399,134.40 is: 598,701.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,555.20 : 996,832.80 = 399,134.40 : x
  2. Step 2: Convert to fraction form
    664,555.20/996,832.80 = 399,134.40/x
  3. Step 3: Cross multiply
    664,555.20x = 996,832.80 × 399,134.40
  4. Step 4: Simplify right side
    664,555.20x = 397,870,261,528.32
  5. Step 5: Solve for x
    x = 397,870,261,528.32/664,555.20
  6. Step 6: Final answer
    x = 598,701.60

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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.