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Finding the Third Proportional to 5.15 and 7.55

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Solution

The third proportional to 5.15 and 7.55 is: 11.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.15 : 7.55 = 7.55 : x
  2. Step 2: Convert to fraction form
    5.15/7.55 = 7.55/x
  3. Step 3: Cross multiply
    5.15x = 7.55 × 7.55
  4. Step 4: Simplify right side
    5.15x = 56.97
  5. Step 5: Solve for x
    x = 56.97/5.15
  6. Step 6: Final answer
    x = 11.06

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.