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Finding the Fourth Proportional to 519,857.20, 779,785.80 and 512,858.80

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Solution

The fourth proportional to 519,857.20, 779,785.80 and 512,858.80 is: 769,288.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,857.20 : 779,785.80 = 512,858.80 : x
  2. Step 2: Convert to fraction form
    519,857.20/779,785.80 = 512,858.80/x
  3. Step 3: Cross multiply
    519,857.20x = 779,785.80 × 512,858.80
  4. Step 4: Simplify right side
    519,857.20x = 399,920,009,645.04
  5. Step 5: Solve for x
    x = 399,920,009,645.04/519,857.20
  6. Step 6: Final answer
    x = 769,288.20

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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.