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Finding the Third Proportional to 2.15 and 3.15

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Solution

The third proportional to 2.15 and 3.15 is: 4.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.15 : 3.15 = 3.15 : x
  2. Step 2: Convert to fraction form
    2.15/3.15 = 3.15/x
  3. Step 3: Cross multiply
    2.15x = 3.15 × 3.15
  4. Step 4: Simplify right side
    2.15x = 9.93
  5. Step 5: Solve for x
    x = 9.93/2.15
  6. Step 6: Final answer
    x = 4.61

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.