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Finding the Fourth Proportional to 203,998.80, 305,998.20 and 85,630.80

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Solution

The fourth proportional to 203,998.80, 305,998.20 and 85,630.80 is: 128,446.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,998.80 : 305,998.20 = 85,630.80 : x
  2. Step 2: Convert to fraction form
    203,998.80/305,998.20 = 85,630.80/x
  3. Step 3: Cross multiply
    203,998.80x = 305,998.20 × 85,630.80
  4. Step 4: Simplify right side
    203,998.80x = 26,202,870,664.56
  5. Step 5: Solve for x
    x = 26,202,870,664.56/203,998.80
  6. Step 6: Final answer
    x = 128,446.20

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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.