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Finding the Fourth Proportional to 203,856.70, 305,930.85 and 85,612.90

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Solution

The fourth proportional to 203,856.70, 305,930.85 and 85,612.90 is: 128,480.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,856.70 : 305,930.85 = 85,612.90 : x
  2. Step 2: Convert to fraction form
    203,856.70/305,930.85 = 85,612.90/x
  3. Step 3: Cross multiply
    203,856.70x = 305,930.85 × 85,612.90
  4. Step 4: Simplify right side
    203,856.70x = 26,191,627,267.97
  5. Step 5: Solve for x
    x = 26,191,627,267.97/203,856.70
  6. Step 6: Final answer
    x = 128,480.58

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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.