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Finding the Fourth Proportional to 11.05, 15.25 and 7.61

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Solution

The fourth proportional to 11.05, 15.25 and 7.61 is: 10.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.05 : 15.25 = 7.61 : x
  2. Step 2: Convert to fraction form
    11.05/15.25 = 7.61/x
  3. Step 3: Cross multiply
    11.05x = 15.25 × 7.61
  4. Step 4: Simplify right side
    11.05x = 116.05
  5. Step 5: Solve for x
    x = 116.05/11.05
  6. Step 6: Final answer
    x = 10.50

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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.