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Finding the Third Proportional to 387,456 and 520,677

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Solution

The third proportional to 387,456 and 520,677 is: 699,704.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,456 : 520,677 = 520,677 : x
  2. Step 2: Convert to fraction form
    387,456/520,677 = 520,677/x
  3. Step 3: Cross multiply
    387,456x = 520,677 × 520,677
  4. Step 4: Simplify right side
    387,456x = 271,104,538,329
  5. Step 5: Solve for x
    x = 271,104,538,329/387,456
  6. Step 6: Final answer
    x = 699,704.07

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.