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Finding the Fourth Proportional to 69,172.91, 103,763.11 and 21,791.73

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Solution

The fourth proportional to 69,172.91, 103,763.11 and 21,791.73 is: 32,688.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,172.91 : 103,763.11 = 21,791.73 : x
  2. Step 2: Convert to fraction form
    69,172.91/103,763.11 = 21,791.73/x
  3. Step 3: Cross multiply
    69,172.91x = 103,763.11 × 21,791.73
  4. Step 4: Simplify right side
    69,172.91x = 2,261,178,144.51
  5. Step 5: Solve for x
    x = 2,261,178,144.51/69,172.91
  6. Step 6: Final answer
    x = 32,688.78

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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.