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Finding the Third Proportional to 4.90 and 7.17

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Solution

The third proportional to 4.90 and 7.17 is: 10.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.90 : 7.17 = 7.17 : x
  2. Step 2: Convert to fraction form
    4.90/7.17 = 7.17/x
  3. Step 3: Cross multiply
    4.90x = 7.17 × 7.17
  4. Step 4: Simplify right side
    4.90x = 51.44
  5. Step 5: Solve for x
    x = 51.44/4.90
  6. Step 6: Final answer
    x = 10.49

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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.