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Finding the Fourth Proportional to 11.55, 17.21 and 10.97

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Solution

The fourth proportional to 11.55, 17.21 and 10.97 is: 16.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.55 : 17.21 = 10.97 : x
  2. Step 2: Convert to fraction form
    11.55/17.21 = 10.97/x
  3. Step 3: Cross multiply
    11.55x = 17.21 × 10.97
  4. Step 4: Simplify right side
    11.55x = 188.80
  5. Step 5: Solve for x
    x = 188.80/11.55
  6. Step 6: Final answer
    x = 16.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.