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Finding the Third Proportional to 2.91 and 7.48

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Solution

The third proportional to 2.91 and 7.48 is: 19.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.91 : 7.48 = 7.48 : x
  2. Step 2: Convert to fraction form
    2.91/7.48 = 7.48/x
  3. Step 3: Cross multiply
    2.91x = 7.48 × 7.48
  4. Step 4: Simplify right side
    2.91x = 55.92
  5. Step 5: Solve for x
    x = 55.92/2.91
  6. Step 6: Final answer
    x = 19.21

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Why These Related Problems?

These problems maintain the same ratio (2.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.