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Finding the Fourth Proportional to 643,912.93, 888,568.14 and 353,517.40

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Solution

The fourth proportional to 643,912.93, 888,568.14 and 353,517.40 is: 487,836.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,912.93 : 888,568.14 = 353,517.40 : x
  2. Step 2: Convert to fraction form
    643,912.93/888,568.14 = 353,517.40/x
  3. Step 3: Cross multiply
    643,912.93x = 888,568.14 × 353,517.40
  4. Step 4: Simplify right side
    643,912.93x = 314,124,298,575.64
  5. Step 5: Solve for x
    x = 314,124,298,575.64/643,912.93
  6. Step 6: Final answer
    x = 487,836.61

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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.