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Finding the Third Proportional to 5.15 and 10.89

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Solution

The third proportional to 5.15 and 10.89 is: 23.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.15 : 10.89 = 10.89 : x
  2. Step 2: Convert to fraction form
    5.15/10.89 = 10.89/x
  3. Step 3: Cross multiply
    5.15x = 10.89 × 10.89
  4. Step 4: Simplify right side
    5.15x = 118.52
  5. Step 5: Solve for x
    x = 118.52/5.15
  6. Step 6: Final answer
    x = 23.03

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.