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Finding the Fourth Proportional to 203,891.40, 305,691.30 and 91,479.60

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Solution

The fourth proportional to 203,891.40, 305,691.30 and 91,479.60 is: 137,153.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,891.40 : 305,691.30 = 91,479.60 : x
  2. Step 2: Convert to fraction form
    203,891.40/305,691.30 = 91,479.60/x
  3. Step 3: Cross multiply
    203,891.40x = 305,691.30 × 91,479.60
  4. Step 4: Simplify right side
    203,891.40x = 27,964,517,847.48
  5. Step 5: Solve for x
    x = 27,964,517,847.48/203,891.40
  6. Step 6: Final answer
    x = 137,153.98

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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.