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Finding the Third Proportional to 5.17 and 9.88

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Solution

The third proportional to 5.17 and 9.88 is: 18.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.17 : 9.88 = 9.88 : x
  2. Step 2: Convert to fraction form
    5.17/9.88 = 9.88/x
  3. Step 3: Cross multiply
    5.17x = 9.88 × 9.88
  4. Step 4: Simplify right side
    5.17x = 97.52
  5. Step 5: Solve for x
    x = 97.52/5.17
  6. Step 6: Final answer
    x = 18.85

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Why These Related Problems?

These problems maintain the same ratio (1.91) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.