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Finding the Fourth Proportional to 678,857.11, 936,718.72 and 392,321.89

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Solution

The fourth proportional to 678,857.11, 936,718.72 and 392,321.89 is: 541,344.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,857.11 : 936,718.72 = 392,321.89 : x
  2. Step 2: Convert to fraction form
    678,857.11/936,718.72 = 392,321.89/x
  3. Step 3: Cross multiply
    678,857.11x = 936,718.72 × 392,321.89
  4. Step 4: Simplify right side
    678,857.11x = 367,495,258,628.78
  5. Step 5: Solve for x
    x = 367,495,258,628.78/678,857.11
  6. Step 6: Final answer
    x = 541,344.05

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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.