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Finding the Third Proportional to 8.91 and 11.58

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Solution

The third proportional to 8.91 and 11.58 is: 15.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.91 : 11.58 = 11.58 : x
  2. Step 2: Convert to fraction form
    8.91/11.58 = 11.58/x
  3. Step 3: Cross multiply
    8.91x = 11.58 × 11.58
  4. Step 4: Simplify right side
    8.91x = 134.09
  5. Step 5: Solve for x
    x = 134.09/8.91
  6. Step 6: Final answer
    x = 15.05

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.