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Finding the Fourth Proportional to 263,912.76, 395,869.14 and 86,420.70

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Solution

The fourth proportional to 263,912.76, 395,869.14 and 86,420.70 is: 129,631.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,912.76 : 395,869.14 = 86,420.70 : x
  2. Step 2: Convert to fraction form
    263,912.76/395,869.14 = 86,420.70/x
  3. Step 3: Cross multiply
    263,912.76x = 395,869.14 × 86,420.70
  4. Step 4: Simplify right side
    263,912.76x = 34,211,288,187.20
  5. Step 5: Solve for x
    x = 34,211,288,187.20/263,912.76
  6. Step 6: Final answer
    x = 129,631.05

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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.