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Finding the Fourth Proportional to 698,113.78, 963,328.98 and 392,120.86

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Solution

The fourth proportional to 698,113.78, 963,328.98 and 392,120.86 is: 541,088.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    698,113.78 : 963,328.98 = 392,120.86 : x
  2. Step 2: Convert to fraction form
    698,113.78/963,328.98 = 392,120.86/x
  3. Step 3: Cross multiply
    698,113.78x = 963,328.98 × 392,120.86
  4. Step 4: Simplify right side
    698,113.78x = 377,741,388,100.52
  5. Step 5: Solve for x
    x = 377,741,388,100.52/698,113.78
  6. Step 6: Final answer
    x = 541,088.57

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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.