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Finding the Fourth Proportional to 714,978.60, 986,676.30 and 392,692.56

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Solution

The fourth proportional to 714,978.60, 986,676.30 and 392,692.56 is: 541,918.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,978.60 : 986,676.30 = 392,692.56 : x
  2. Step 2: Convert to fraction form
    714,978.60/986,676.30 = 392,692.56/x
  3. Step 3: Cross multiply
    714,978.60x = 986,676.30 × 392,692.56
  4. Step 4: Simplify right side
    714,978.60x = 387,460,442,138.33
  5. Step 5: Solve for x
    x = 387,460,442,138.33/714,978.60
  6. Step 6: Final answer
    x = 541,918.94

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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.