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Finding the Third Proportional to 3,920 and 5,770

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Solution

The third proportional to 3,920 and 5,770 is: 8,493.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920 : 5,770 = 5,770 : x
  2. Step 2: Convert to fraction form
    3,920/5,770 = 5,770/x
  3. Step 3: Cross multiply
    3,920x = 5,770 × 5,770
  4. Step 4: Simplify right side
    3,920x = 33,292,900
  5. Step 5: Solve for x
    x = 33,292,900/3,920
  6. Step 6: Final answer
    x = 8,493.09

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.