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Finding the Fourth Proportional to 638,565.66, 881,158.32 and 393,512.31

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Solution

The fourth proportional to 638,565.66, 881,158.32 and 393,512.31 is: 543,008.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,565.66 : 881,158.32 = 393,512.31 : x
  2. Step 2: Convert to fraction form
    638,565.66/881,158.32 = 393,512.31/x
  3. Step 3: Cross multiply
    638,565.66x = 881,158.32 × 393,512.31
  4. Step 4: Simplify right side
    638,565.66x = 346,746,645,978.92
  5. Step 5: Solve for x
    x = 346,746,645,978.92/638,565.66
  6. Step 6: Final answer
    x = 543,008.60

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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.