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Finding the Third Proportional to 2.61 and 5.51

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Solution

The third proportional to 2.61 and 5.51 is: 11.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.61 : 5.51 = 5.51 : x
  2. Step 2: Convert to fraction form
    2.61/5.51 = 5.51/x
  3. Step 3: Cross multiply
    2.61x = 5.51 × 5.51
  4. Step 4: Simplify right side
    2.61x = 30.37
  5. Step 5: Solve for x
    x = 30.37/2.61
  6. Step 6: Final answer
    x = 11.63

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.