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Finding the Third Proportional to 2.60 and 7.15

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Solution

The third proportional to 2.60 and 7.15 is: 19.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.60 : 7.15 = 7.15 : x
  2. Step 2: Convert to fraction form
    2.60/7.15 = 7.15/x
  3. Step 3: Cross multiply
    2.60x = 7.15 × 7.15
  4. Step 4: Simplify right side
    2.60x = 51.15
  5. Step 5: Solve for x
    x = 51.15/2.60
  6. Step 6: Final answer
    x = 19.67

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Why These Related Problems?

These problems maintain the same ratio (2.75) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.