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Finding the Third Proportional to 4.90 and 10.28

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Solution

The third proportional to 4.90 and 10.28 is: 21.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.90 : 10.28 = 10.28 : x
  2. Step 2: Convert to fraction form
    4.90/10.28 = 10.28/x
  3. Step 3: Cross multiply
    4.90x = 10.28 × 10.28
  4. Step 4: Simplify right side
    4.90x = 105.74
  5. Step 5: Solve for x
    x = 105.74/4.90
  6. Step 6: Final answer
    x = 21.56

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.