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Finding the Third Proportional to 5.49 and 10.79

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Solution

The third proportional to 5.49 and 10.79 is: 21.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.49 : 10.79 = 10.79 : x
  2. Step 2: Convert to fraction form
    5.49/10.79 = 10.79/x
  3. Step 3: Cross multiply
    5.49x = 10.79 × 10.79
  4. Step 4: Simplify right side
    5.49x = 116.41
  5. Step 5: Solve for x
    x = 116.41/5.49
  6. Step 6: Final answer
    x = 21.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.