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Finding the Fourth Proportional to 11.09, 16.61 and 7.75

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Solution

The fourth proportional to 11.09, 16.61 and 7.75 is: 11.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.09 : 16.61 = 7.75 : x
  2. Step 2: Convert to fraction form
    11.09/16.61 = 7.75/x
  3. Step 3: Cross multiply
    11.09x = 16.61 × 7.75
  4. Step 4: Simplify right side
    11.09x = 128.62
  5. Step 5: Solve for x
    x = 128.62/11.09
  6. Step 6: Final answer
    x = 11.60

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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.