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Finding the Third Proportional to 4.28 and 6.91

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Solution

The third proportional to 4.28 and 6.91 is: 11.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.28 : 6.91 = 6.91 : x
  2. Step 2: Convert to fraction form
    4.28/6.91 = 6.91/x
  3. Step 3: Cross multiply
    4.28x = 6.91 × 6.91
  4. Step 4: Simplify right side
    4.28x = 47.72
  5. Step 5: Solve for x
    x = 47.72/4.28
  6. Step 6: Final answer
    x = 11.15

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.