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Finding the Third Proportional to 206,878 and 316,329

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Solution

The third proportional to 206,878 and 316,329 is: 483,686.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,878 : 316,329 = 316,329 : x
  2. Step 2: Convert to fraction form
    206,878/316,329 = 316,329/x
  3. Step 3: Cross multiply
    206,878x = 316,329 × 316,329
  4. Step 4: Simplify right side
    206,878x = 100,064,036,241
  5. Step 5: Solve for x
    x = 100,064,036,241/206,878
  6. Step 6: Final answer
    x = 483,686.21

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.