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Finding the Fourth Proportional to 203,856.20, 305,930.10 and 85,612.40

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Solution

The fourth proportional to 203,856.20, 305,930.10 and 85,612.40 is: 128,479.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,856.20 : 305,930.10 = 85,612.40 : x
  2. Step 2: Convert to fraction form
    203,856.20/305,930.10 = 85,612.40/x
  3. Step 3: Cross multiply
    203,856.20x = 305,930.10 × 85,612.40
  4. Step 4: Simplify right side
    203,856.20x = 26,191,410,093.24
  5. Step 5: Solve for x
    x = 26,191,410,093.24/203,856.20
  6. Step 6: Final answer
    x = 128,479.83

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1.5x scale

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.