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Finding the Third Proportional to 213,878 and 331,130

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Solution

The third proportional to 213,878 and 331,130 is: 512,661.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,878 : 331,130 = 331,130 : x
  2. Step 2: Convert to fraction form
    213,878/331,130 = 331,130/x
  3. Step 3: Cross multiply
    213,878x = 331,130 × 331,130
  4. Step 4: Simplify right side
    213,878x = 109,647,076,900
  5. Step 5: Solve for x
    x = 109,647,076,900/213,878
  6. Step 6: Final answer
    x = 512,661.78

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.