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Finding the Fourth Proportional to 643,906.53, 888,672.87 and 389,257.11

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Solution

The fourth proportional to 643,906.53, 888,672.87 and 389,257.11 is: 537,224.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,906.53 : 888,672.87 = 389,257.11 : x
  2. Step 2: Convert to fraction form
    643,906.53/888,672.87 = 389,257.11/x
  3. Step 3: Cross multiply
    643,906.53x = 888,672.87 × 389,257.11
  4. Step 4: Simplify right side
    643,906.53x = 345,922,233,111.61
  5. Step 5: Solve for x
    x = 345,922,233,111.61/643,906.53
  6. Step 6: Final answer
    x = 537,224.30

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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.