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Finding the Third Proportional to 5.91 and 12.72

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Solution

The third proportional to 5.91 and 12.72 is: 27.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.91 : 12.72 = 12.72 : x
  2. Step 2: Convert to fraction form
    5.91/12.72 = 12.72/x
  3. Step 3: Cross multiply
    5.91x = 12.72 × 12.72
  4. Step 4: Simplify right side
    5.91x = 161.77
  5. Step 5: Solve for x
    x = 161.77/5.91
  6. Step 6: Final answer
    x = 27.39

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.