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Finding the Third Proportional to 2.13 and 4.31

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Solution

The third proportional to 2.13 and 4.31 is: 8.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.13 : 4.31 = 4.31 : x
  2. Step 2: Convert to fraction form
    2.13/4.31 = 4.31/x
  3. Step 3: Cross multiply
    2.13x = 4.31 × 4.31
  4. Step 4: Simplify right side
    2.13x = 18.60
  5. Step 5: Solve for x
    x = 18.60/2.13
  6. Step 6: Final answer
    x = 8.75

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.