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Finding the Fourth Proportional to 203,639.88, 305,337.06 and 91,299.78

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Solution

The fourth proportional to 203,639.88, 305,337.06 and 91,299.78 is: 136,894.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,639.88 : 305,337.06 = 91,299.78 : x
  2. Step 2: Convert to fraction form
    203,639.88/305,337.06 = 91,299.78/x
  3. Step 3: Cross multiply
    203,639.88x = 305,337.06 × 91,299.78
  4. Step 4: Simplify right side
    203,639.88x = 27,877,206,403.85
  5. Step 5: Solve for x
    x = 27,877,206,403.85/203,639.88
  6. Step 6: Final answer
    x = 136,894.63

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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.