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Finding the Fourth Proportional to 681,857.80, 940,881.63 and 391,453.36

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Solution

The fourth proportional to 681,857.80, 940,881.63 and 391,453.36 is: 540,158.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,857.80 : 940,881.63 = 391,453.36 : x
  2. Step 2: Convert to fraction form
    681,857.80/940,881.63 = 391,453.36/x
  3. Step 3: Cross multiply
    681,857.80x = 940,881.63 × 391,453.36
  4. Step 4: Simplify right side
    681,857.80x = 368,311,275,425.78
  5. Step 5: Solve for x
    x = 368,311,275,425.78/681,857.80
  6. Step 6: Final answer
    x = 540,158.48

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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.