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Finding the Third Proportional to 8.58 and 13.61

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Solution

The third proportional to 8.58 and 13.61 is: 21.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.58 : 13.61 = 13.61 : x
  2. Step 2: Convert to fraction form
    8.58/13.61 = 13.61/x
  3. Step 3: Cross multiply
    8.58x = 13.61 × 13.61
  4. Step 4: Simplify right side
    8.58x = 185.11
  5. Step 5: Solve for x
    x = 185.11/8.58
  6. Step 6: Final answer
    x = 21.58

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.