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Finding the Fourth Proportional to 11.23, 15.45 and 9.61

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Solution

The fourth proportional to 11.23, 15.45 and 9.61 is: 13.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.23 : 15.45 = 9.61 : x
  2. Step 2: Convert to fraction form
    11.23/15.45 = 9.61/x
  3. Step 3: Cross multiply
    11.23x = 15.45 × 9.61
  4. Step 4: Simplify right side
    11.23x = 148.47
  5. Step 5: Solve for x
    x = 148.47/11.23
  6. Step 6: Final answer
    x = 13.22

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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.