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Finding the Fourth Proportional to 521,857.80, 782,786.70 and 355,969.80

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Solution

The fourth proportional to 521,857.80, 782,786.70 and 355,969.80 is: 533,954.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,857.80 : 782,786.70 = 355,969.80 : x
  2. Step 2: Convert to fraction form
    521,857.80/782,786.70 = 355,969.80/x
  3. Step 3: Cross multiply
    521,857.80x = 782,786.70 × 355,969.80
  4. Step 4: Simplify right side
    521,857.80x = 278,648,425,041.66
  5. Step 5: Solve for x
    x = 278,648,425,041.66/521,857.80
  6. Step 6: Final answer
    x = 533,954.70

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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.