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Finding the Fourth Proportional to 203,906.40, 305,859.60 and 140,920.80

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Solution

The fourth proportional to 203,906.40, 305,859.60 and 140,920.80 is: 211,381.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,906.40 : 305,859.60 = 140,920.80 : x
  2. Step 2: Convert to fraction form
    203,906.40/305,859.60 = 140,920.80/x
  3. Step 3: Cross multiply
    203,906.40x = 305,859.60 × 140,920.80
  4. Step 4: Simplify right side
    203,906.40x = 43,101,979,519.68
  5. Step 5: Solve for x
    x = 43,101,979,519.68/203,906.40
  6. Step 6: Final answer
    x = 211,381.20

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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.