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Finding the Fourth Proportional to 519,858.78, 717,379.42 and 290,370.39

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Solution

The fourth proportional to 519,858.78, 717,379.42 and 290,370.39 is: 400,696.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,858.78 : 717,379.42 = 290,370.39 : x
  2. Step 2: Convert to fraction form
    519,858.78/717,379.42 = 290,370.39/x
  3. Step 3: Cross multiply
    519,858.78x = 717,379.42 × 290,370.39
  4. Step 4: Simplify right side
    519,858.78x = 208,305,739,091.72
  5. Step 5: Solve for x
    x = 208,305,739,091.72/519,858.78
  6. Step 6: Final answer
    x = 400,696.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.