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Finding the Third Proportional to 4.82 and 9.90

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Solution

The third proportional to 4.82 and 9.90 is: 20.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.82 : 9.90 = 9.90 : x
  2. Step 2: Convert to fraction form
    4.82/9.90 = 9.90/x
  3. Step 3: Cross multiply
    4.82x = 9.90 × 9.90
  4. Step 4: Simplify right side
    4.82x = 98.08
  5. Step 5: Solve for x
    x = 98.08/4.82
  6. Step 6: Final answer
    x = 20.33

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.