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Finding the Fourth Proportional to 265,734.78, 398,653.50 and 85,868.61

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Solution

The fourth proportional to 265,734.78, 398,653.50 and 85,868.61 is: 128,819.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,734.78 : 398,653.50 = 85,868.61 : x
  2. Step 2: Convert to fraction form
    265,734.78/398,653.50 = 85,868.61/x
  3. Step 3: Cross multiply
    265,734.78x = 398,653.50 × 85,868.61
  4. Step 4: Simplify right side
    265,734.78x = 34,231,821,916.64
  5. Step 5: Solve for x
    x = 34,231,821,916.64/265,734.78
  6. Step 6: Final answer
    x = 128,819.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.