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Finding the Fourth Proportional to 646,685.87, 892,285.76 and 392,099.63

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Solution

The fourth proportional to 646,685.87, 892,285.76 and 392,099.63 is: 541,012.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,685.87 : 892,285.76 = 392,099.63 : x
  2. Step 2: Convert to fraction form
    646,685.87/892,285.76 = 392,099.63/x
  3. Step 3: Cross multiply
    646,685.87x = 892,285.76 × 392,099.63
  4. Step 4: Simplify right side
    646,685.87x = 349,864,914,389.77
  5. Step 5: Solve for x
    x = 349,864,914,389.77/646,685.87
  6. Step 6: Final answer
    x = 541,012.15

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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.