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Finding the Fourth Proportional to 71,940.30, 99,272.97 and 40,107.30

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Solution

The fourth proportional to 71,940.30, 99,272.97 and 40,107.30 is: 55,345.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,940.30 : 99,272.97 = 40,107.30 : x
  2. Step 2: Convert to fraction form
    71,940.30/99,272.97 = 40,107.30/x
  3. Step 3: Cross multiply
    71,940.30x = 99,272.97 × 40,107.30
  4. Step 4: Simplify right side
    71,940.30x = 3,981,570,789.68
  5. Step 5: Solve for x
    x = 3,981,570,789.68/71,940.30
  6. Step 6: Final answer
    x = 55,345.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.