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Finding the Fourth Proportional to 639,105.40, 957,491.70 and 520,132.60

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Solution

The fourth proportional to 639,105.40, 957,491.70 and 520,132.60 is: 779,249.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,105.40 : 957,491.70 = 520,132.60 : x
  2. Step 2: Convert to fraction form
    639,105.40/957,491.70 = 520,132.60/x
  3. Step 3: Cross multiply
    639,105.40x = 957,491.70 × 520,132.60
  4. Step 4: Simplify right side
    639,105.40x = 498,022,647,399.42
  5. Step 5: Solve for x
    x = 498,022,647,399.42/639,105.40
  6. Step 6: Final answer
    x = 779,249.63

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Double scale
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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.