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Finding the Fourth Proportional to 11.91, 16.43 and 7.61

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Solution

The fourth proportional to 11.91, 16.43 and 7.61 is: 10.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.91 : 16.43 = 7.61 : x
  2. Step 2: Convert to fraction form
    11.91/16.43 = 7.61/x
  3. Step 3: Cross multiply
    11.91x = 16.43 × 7.61
  4. Step 4: Simplify right side
    11.91x = 124.91
  5. Step 5: Solve for x
    x = 124.91/11.91
  6. Step 6: Final answer
    x = 10.49

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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.