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Finding the Third Proportional to 8.63 and 13.31

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Solution

The third proportional to 8.63 and 13.31 is: 20.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.63 : 13.31 = 13.31 : x
  2. Step 2: Convert to fraction form
    8.63/13.31 = 13.31/x
  3. Step 3: Cross multiply
    8.63x = 13.31 × 13.31
  4. Step 4: Simplify right side
    8.63x = 177.22
  5. Step 5: Solve for x
    x = 177.22/8.63
  6. Step 6: Final answer
    x = 20.55

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.