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Finding the Third Proportional to 3.71 and 7.90

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Solution

The third proportional to 3.71 and 7.90 is: 16.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.71 : 7.90 = 7.90 : x
  2. Step 2: Convert to fraction form
    3.71/7.90 = 7.90/x
  3. Step 3: Cross multiply
    3.71x = 7.90 × 7.90
  4. Step 4: Simplify right side
    3.71x = 62.39
  5. Step 5: Solve for x
    x = 62.39/3.71
  6. Step 6: Final answer
    x = 16.82

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.