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Finding the Third Proportional to 2.47 and 3.91

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Solution

The third proportional to 2.47 and 3.91 is: 6.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.47 : 3.91 = 3.91 : x
  2. Step 2: Convert to fraction form
    2.47/3.91 = 3.91/x
  3. Step 3: Cross multiply
    2.47x = 3.91 × 3.91
  4. Step 4: Simplify right side
    2.47x = 15.26
  5. Step 5: Solve for x
    x = 15.26/2.47
  6. Step 6: Final answer
    x = 6.18

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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.