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Finding the Fourth Proportional to 11.75, 16.22 and 7.65

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Solution

The fourth proportional to 11.75, 16.22 and 7.65 is: 10.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.75 : 16.22 = 7.65 : x
  2. Step 2: Convert to fraction form
    11.75/16.22 = 7.65/x
  3. Step 3: Cross multiply
    11.75x = 16.22 × 7.65
  4. Step 4: Simplify right side
    11.75x = 124.10
  5. Step 5: Solve for x
    x = 124.10/11.75
  6. Step 6: Final answer
    x = 10.56

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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.