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Finding the Fourth Proportional to 621,605.28, 857,951.12 and 395,206.56

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Solution

The fourth proportional to 621,605.28, 857,951.12 and 395,206.56 is: 545,471.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,605.28 : 857,951.12 = 395,206.56 : x
  2. Step 2: Convert to fraction form
    621,605.28/857,951.12 = 395,206.56/x
  3. Step 3: Cross multiply
    621,605.28x = 857,951.12 × 395,206.56
  4. Step 4: Simplify right side
    621,605.28x = 339,067,910,783.35
  5. Step 5: Solve for x
    x = 339,067,910,783.35/621,605.28
  6. Step 6: Final answer
    x = 545,471.41

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1.5x scale

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.