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Finding the Fourth Proportional to 284.26, 391.92 and 231.61

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Solution

The fourth proportional to 284.26, 391.92 and 231.61 is: 319.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.26 : 391.92 = 231.61 : x
  2. Step 2: Convert to fraction form
    284.26/391.92 = 231.61/x
  3. Step 3: Cross multiply
    284.26x = 391.92 × 231.61
  4. Step 4: Simplify right side
    284.26x = 90,772.59
  5. Step 5: Solve for x
    x = 90,772.59/284.26
  6. Step 6: Final answer
    x = 319.33

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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.