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Finding the Third Proportional to 213,137 and 318,243

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Solution

The third proportional to 213,137 and 318,243 is: 475,180.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,137 : 318,243 = 318,243 : x
  2. Step 2: Convert to fraction form
    213,137/318,243 = 318,243/x
  3. Step 3: Cross multiply
    213,137x = 318,243 × 318,243
  4. Step 4: Simplify right side
    213,137x = 101,278,607,049
  5. Step 5: Solve for x
    x = 101,278,607,049/213,137
  6. Step 6: Final answer
    x = 475,180.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.