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Finding the Third Proportional to 7.15 and 11.29

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Solution

The third proportional to 7.15 and 11.29 is: 17.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.15 : 11.29 = 11.29 : x
  2. Step 2: Convert to fraction form
    7.15/11.29 = 11.29/x
  3. Step 3: Cross multiply
    7.15x = 11.29 × 11.29
  4. Step 4: Simplify right side
    7.15x = 127.41
  5. Step 5: Solve for x
    x = 127.41/7.15
  6. Step 6: Final answer
    x = 17.83

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.