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Finding the Third Proportional to 5.45 and 12.31

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Solution

The third proportional to 5.45 and 12.31 is: 27.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.45 : 12.31 = 12.31 : x
  2. Step 2: Convert to fraction form
    5.45/12.31 = 12.31/x
  3. Step 3: Cross multiply
    5.45x = 12.31 × 12.31
  4. Step 4: Simplify right side
    5.45x = 151.46
  5. Step 5: Solve for x
    x = 151.46/5.45
  6. Step 6: Final answer
    x = 27.80

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Why These Related Problems?

These problems maintain the same ratio (2.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.