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Finding the Fourth Proportional to 203,859.72, 305,855.19 and 85,499.28

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Solution

The fourth proportional to 203,859.72, 305,855.19 and 85,499.28 is: 128,276.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,859.72 : 305,855.19 = 85,499.28 : x
  2. Step 2: Convert to fraction form
    203,859.72/305,855.19 = 85,499.28/x
  3. Step 3: Cross multiply
    203,859.72x = 305,855.19 × 85,499.28
  4. Step 4: Simplify right side
    203,859.72x = 26,150,398,529.26
  5. Step 5: Solve for x
    x = 26,150,398,529.26/203,859.72
  6. Step 6: Final answer
    x = 128,276.44

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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.