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Finding the Third Proportional to 4.31 and 9.38

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Solution

The third proportional to 4.31 and 9.38 is: 20.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.31 : 9.38 = 9.38 : x
  2. Step 2: Convert to fraction form
    4.31/9.38 = 9.38/x
  3. Step 3: Cross multiply
    4.31x = 9.38 × 9.38
  4. Step 4: Simplify right side
    4.31x = 87.89
  5. Step 5: Solve for x
    x = 87.89/4.31
  6. Step 6: Final answer
    x = 20.38

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.