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Finding the Fourth Proportional to 69,115.71, 103,691.68 and 21,728.89

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Solution

The fourth proportional to 69,115.71, 103,691.68 and 21,728.89 is: 32,599.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,115.71 : 103,691.68 = 21,728.89 : x
  2. Step 2: Convert to fraction form
    69,115.71/103,691.68 = 21,728.89/x
  3. Step 3: Cross multiply
    69,115.71x = 103,691.68 × 21,728.89
  4. Step 4: Simplify right side
    69,115.71x = 2,253,105,183.93
  5. Step 5: Solve for x
    x = 2,253,105,183.93/69,115.71
  6. Step 6: Final answer
    x = 32,599.03

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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.