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Finding the Third Proportional to 2.90 and 6.39

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Solution

The third proportional to 2.90 and 6.39 is: 14.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.90 : 6.39 = 6.39 : x
  2. Step 2: Convert to fraction form
    2.90/6.39 = 6.39/x
  3. Step 3: Cross multiply
    2.90x = 6.39 × 6.39
  4. Step 4: Simplify right side
    2.90x = 40.80
  5. Step 5: Solve for x
    x = 40.80/2.90
  6. Step 6: Final answer
    x = 14.05

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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.