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Finding the Third Proportional to 5.31 and 8.25

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Solution

The third proportional to 5.31 and 8.25 is: 12.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.31 : 8.25 = 8.25 : x
  2. Step 2: Convert to fraction form
    5.31/8.25 = 8.25/x
  3. Step 3: Cross multiply
    5.31x = 8.25 × 8.25
  4. Step 4: Simplify right side
    5.31x = 68.06
  5. Step 5: Solve for x
    x = 68.06/5.31
  6. Step 6: Final answer
    x = 12.81

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.