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Finding the Fourth Proportional to 10.89, 15.06 and 9.09

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Solution

The fourth proportional to 10.89, 15.06 and 9.09 is: 12.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.89 : 15.06 = 9.09 : x
  2. Step 2: Convert to fraction form
    10.89/15.06 = 9.09/x
  3. Step 3: Cross multiply
    10.89x = 15.06 × 9.09
  4. Step 4: Simplify right side
    10.89x = 136.90
  5. Step 5: Solve for x
    x = 136.90/10.89
  6. Step 6: Final answer
    x = 12.57

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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.