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Finding the Third Proportional to 7.15 and 15.74

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Solution

The third proportional to 7.15 and 15.74 is: 34.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.15 : 15.74 = 15.74 : x
  2. Step 2: Convert to fraction form
    7.15/15.74 = 15.74/x
  3. Step 3: Cross multiply
    7.15x = 15.74 × 15.74
  4. Step 4: Simplify right side
    7.15x = 247.61
  5. Step 5: Solve for x
    x = 247.61/7.15
  6. Step 6: Final answer
    x = 34.61

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.