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Finding the Fourth Proportional to 519.67, 779.51 and 411.31

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Solution

The fourth proportional to 519.67, 779.51 and 411.31 is: 616.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.67 : 779.51 = 411.31 : x
  2. Step 2: Convert to fraction form
    519.67/779.51 = 411.31/x
  3. Step 3: Cross multiply
    519.67x = 779.51 × 411.31
  4. Step 4: Simplify right side
    519.67x = 320,620.26
  5. Step 5: Solve for x
    x = 320,620.26/519.67
  6. Step 6: Final answer
    x = 616.97

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Double scale
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Similar ratio
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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.