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Finding the Fourth Proportional to 519,787.18, 718,008.38 and 391,693.91

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Solution

The fourth proportional to 519,787.18, 718,008.38 and 391,693.91 is: 541,066.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,787.18 : 718,008.38 = 391,693.91 : x
  2. Step 2: Convert to fraction form
    519,787.18/718,008.38 = 391,693.91/x
  3. Step 3: Cross multiply
    519,787.18x = 718,008.38 × 391,693.91
  4. Step 4: Simplify right side
    519,787.18x = 281,239,509,774.97
  5. Step 5: Solve for x
    x = 281,239,509,774.97/519,787.18
  6. Step 6: Final answer
    x = 541,066.65

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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.