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Finding the Third Proportional to 5.42 and 11.80

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Solution

The third proportional to 5.42 and 11.80 is: 25.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.42 : 11.80 = 11.80 : x
  2. Step 2: Convert to fraction form
    5.42/11.80 = 11.80/x
  3. Step 3: Cross multiply
    5.42x = 11.80 × 11.80
  4. Step 4: Simplify right side
    5.42x = 139.30
  5. Step 5: Solve for x
    x = 139.30/5.42
  6. Step 6: Final answer
    x = 25.71

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.