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Finding the Third Proportional to 4.87 and 9.20

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Solution

The third proportional to 4.87 and 9.20 is: 17.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.87 : 9.20 = 9.20 : x
  2. Step 2: Convert to fraction form
    4.87/9.20 = 9.20/x
  3. Step 3: Cross multiply
    4.87x = 9.20 × 9.20
  4. Step 4: Simplify right side
    4.87x = 84.65
  5. Step 5: Solve for x
    x = 84.65/4.87
  6. Step 6: Final answer
    x = 17.38

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Why These Related Problems?

These problems maintain the same ratio (1.89) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.