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Finding the Third Proportional to 3.98 and 6.30

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Solution

The third proportional to 3.98 and 6.30 is: 9.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.98 : 6.30 = 6.30 : x
  2. Step 2: Convert to fraction form
    3.98/6.30 = 6.30/x
  3. Step 3: Cross multiply
    3.98x = 6.30 × 6.30
  4. Step 4: Simplify right side
    3.98x = 39.71
  5. Step 5: Solve for x
    x = 39.71/3.98
  6. Step 6: Final answer
    x = 9.97

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.