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Finding the Fourth Proportional to 519,857.70, 779,786.55 and 512,859.30

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Solution

The fourth proportional to 519,857.70, 779,786.55 and 512,859.30 is: 769,288.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,857.70 : 779,786.55 = 512,859.30 : x
  2. Step 2: Convert to fraction form
    519,857.70/779,786.55 = 512,859.30/x
  3. Step 3: Cross multiply
    519,857.70x = 779,786.55 × 512,859.30
  4. Step 4: Simplify right side
    519,857.70x = 399,920,784,182.42
  5. Step 5: Solve for x
    x = 399,920,784,182.42/519,857.70
  6. Step 6: Final answer
    x = 769,288.95

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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.