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Finding the Fourth Proportional to 3,489.75, 5,231.79 and 1,929.69

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Solution

The fourth proportional to 3,489.75, 5,231.79 and 1,929.69 is: 2,892.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,489.75 : 5,231.79 = 1,929.69 : x
  2. Step 2: Convert to fraction form
    3,489.75/5,231.79 = 1,929.69/x
  3. Step 3: Cross multiply
    3,489.75x = 5,231.79 × 1,929.69
  4. Step 4: Simplify right side
    3,489.75x = 10,095,732.85
  5. Step 5: Solve for x
    x = 10,095,732.85/3,489.75
  6. Step 6: Final answer
    x = 2,892.97

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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.