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Finding the Third Proportional to 217,721 and 320,176

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Solution

The third proportional to 217,721 and 320,176 is: 470,844.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,721 : 320,176 = 320,176 : x
  2. Step 2: Convert to fraction form
    217,721/320,176 = 320,176/x
  3. Step 3: Cross multiply
    217,721x = 320,176 × 320,176
  4. Step 4: Simplify right side
    217,721x = 102,512,670,976
  5. Step 5: Solve for x
    x = 102,512,670,976/217,721
  6. Step 6: Final answer
    x = 470,844.20

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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.