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Finding the Fourth Proportional to 639,886.92, 883,025.79 and 353,400.86

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Solution

The fourth proportional to 639,886.92, 883,025.79 and 353,400.86 is: 487,683.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,886.92 : 883,025.79 = 353,400.86 : x
  2. Step 2: Convert to fraction form
    639,886.92/883,025.79 = 353,400.86/x
  3. Step 3: Cross multiply
    639,886.92x = 883,025.79 × 353,400.86
  4. Step 4: Simplify right side
    639,886.92x = 312,062,069,173.05
  5. Step 5: Solve for x
    x = 312,062,069,173.05/639,886.92
  6. Step 6: Final answer
    x = 487,683.15

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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.