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Finding the Third Proportional to 4.89 and 9.61

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Solution

The third proportional to 4.89 and 9.61 is: 18.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.89 : 9.61 = 9.61 : x
  2. Step 2: Convert to fraction form
    4.89/9.61 = 9.61/x
  3. Step 3: Cross multiply
    4.89x = 9.61 × 9.61
  4. Step 4: Simplify right side
    4.89x = 92.36
  5. Step 5: Solve for x
    x = 92.36/4.89
  6. Step 6: Final answer
    x = 18.90

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.