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Finding the Third Proportional to 4.90 and 11.71

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Solution

The third proportional to 4.90 and 11.71 is: 27.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.90 : 11.71 = 11.71 : x
  2. Step 2: Convert to fraction form
    4.90/11.71 = 11.71/x
  3. Step 3: Cross multiply
    4.90x = 11.71 × 11.71
  4. Step 4: Simplify right side
    4.90x = 137.05
  5. Step 5: Solve for x
    x = 137.05/4.90
  6. Step 6: Final answer
    x = 27.95

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.