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Finding the Third Proportional to 206,920 and 312,108

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Solution

The third proportional to 206,920 and 312,108 is: 470,768.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,920 : 312,108 = 312,108 : x
  2. Step 2: Convert to fraction form
    206,920/312,108 = 312,108/x
  3. Step 3: Cross multiply
    206,920x = 312,108 × 312,108
  4. Step 4: Simplify right side
    206,920x = 97,411,403,664
  5. Step 5: Solve for x
    x = 97,411,403,664/206,920
  6. Step 6: Final answer
    x = 470,768.43

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.