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Finding the Third Proportional to 2.15 and 5.12

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Solution

The third proportional to 2.15 and 5.12 is: 12.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.15 : 5.12 = 5.12 : x
  2. Step 2: Convert to fraction form
    2.15/5.12 = 5.12/x
  3. Step 3: Cross multiply
    2.15x = 5.12 × 5.12
  4. Step 4: Simplify right side
    2.15x = 26.23
  5. Step 5: Solve for x
    x = 26.23/2.15
  6. Step 6: Final answer
    x = 12.19

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Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.