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Finding the Fourth Proportional to 403,857.80, 605,786.70 and 137,918.60

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Solution

The fourth proportional to 403,857.80, 605,786.70 and 137,918.60 is: 206,877.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,857.80 : 605,786.70 = 137,918.60 : x
  2. Step 2: Convert to fraction form
    403,857.80/605,786.70 = 137,918.60/x
  3. Step 3: Cross multiply
    403,857.80x = 605,786.70 × 137,918.60
  4. Step 4: Simplify right side
    403,857.80x = 83,549,253,562.62
  5. Step 5: Solve for x
    x = 83,549,253,562.62/403,857.80
  6. Step 6: Final answer
    x = 206,877.90

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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.