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Finding the Fourth Proportional to 515,299.58, 711,120.42 and 386,009

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Solution

The fourth proportional to 515,299.58, 711,120.42 and 386,009 is: 532,697.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,299.58 : 711,120.42 = 386,009 : x
  2. Step 2: Convert to fraction form
    515,299.58/711,120.42 = 386,009/x
  3. Step 3: Cross multiply
    515,299.58x = 711,120.42 × 386,009
  4. Step 4: Simplify right side
    515,299.58x = 274,498,882,203.78
  5. Step 5: Solve for x
    x = 274,498,882,203.78/515,299.58
  6. Step 6: Final answer
    x = 532,697.66

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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.