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Finding the Third Proportional to 4.19 and 9.31

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Solution

The third proportional to 4.19 and 9.31 is: 20.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.19 : 9.31 = 9.31 : x
  2. Step 2: Convert to fraction form
    4.19/9.31 = 9.31/x
  3. Step 3: Cross multiply
    4.19x = 9.31 × 9.31
  4. Step 4: Simplify right side
    4.19x = 86.72
  5. Step 5: Solve for x
    x = 86.72/4.19
  6. Step 6: Final answer
    x = 20.71

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.