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Finding the Third Proportional to 4.00 and 5.15

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Solution

The third proportional to 4.00 and 5.15 is: 6.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.00 : 5.15 = 5.15 : x
  2. Step 2: Convert to fraction form
    4.00/5.15 = 5.15/x
  3. Step 3: Cross multiply
    4.00x = 5.15 × 5.15
  4. Step 4: Simplify right side
    4.00x = 26.56
  5. Step 5: Solve for x
    x = 26.56/4.00
  6. Step 6: Final answer
    x = 6.64

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.