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Finding the Third Proportional to 3.99 and 6.20

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Solution

The third proportional to 3.99 and 6.20 is: 9.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.99 : 6.20 = 6.20 : x
  2. Step 2: Convert to fraction form
    3.99/6.20 = 6.20/x
  3. Step 3: Cross multiply
    3.99x = 6.20 × 6.20
  4. Step 4: Simplify right side
    3.99x = 38.45
  5. Step 5: Solve for x
    x = 38.45/3.99
  6. Step 6: Final answer
    x = 9.63

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.