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Finding the Fourth Proportional to 10.80, 15.11 and 10.80

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Solution

The fourth proportional to 10.80, 15.11 and 10.80 is: 15.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.80 : 15.11 = 10.80 : x
  2. Step 2: Convert to fraction form
    10.80/15.11 = 10.80/x
  3. Step 3: Cross multiply
    10.80x = 15.11 × 10.80
  4. Step 4: Simplify right side
    10.80x = 163.17
  5. Step 5: Solve for x
    x = 163.17/10.80
  6. Step 6: Final answer
    x = 15.11

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.