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Finding the Third Proportional to 3.30 and 7.20

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Solution

The third proportional to 3.30 and 7.20 is: 15.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.30 : 7.20 = 7.20 : x
  2. Step 2: Convert to fraction form
    3.30/7.20 = 7.20/x
  3. Step 3: Cross multiply
    3.30x = 7.20 × 7.20
  4. Step 4: Simplify right side
    3.30x = 51.89
  5. Step 5: Solve for x
    x = 51.89/3.30
  6. Step 6: Final answer
    x = 15.73

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.