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Finding the Fourth Proportional to 263,507.10, 395,163.45 and 86,019.90

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Solution

The fourth proportional to 263,507.10, 395,163.45 and 86,019.90 is: 128,998.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,507.10 : 395,163.45 = 86,019.90 : x
  2. Step 2: Convert to fraction form
    263,507.10/395,163.45 = 86,019.90/x
  3. Step 3: Cross multiply
    263,507.10x = 395,163.45 × 86,019.90
  4. Step 4: Simplify right side
    263,507.10x = 33,991,920,452.66
  5. Step 5: Solve for x
    x = 33,991,920,452.66/263,507.10
  6. Step 6: Final answer
    x = 128,998.12

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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.