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Finding the Third Proportional to 320,520 and 685,509

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Solution

The third proportional to 320,520 and 685,509 is: 1,466,125.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,520 : 685,509 = 685,509 : x
  2. Step 2: Convert to fraction form
    320,520/685,509 = 685,509/x
  3. Step 3: Cross multiply
    320,520x = 685,509 × 685,509
  4. Step 4: Simplify right side
    320,520x = 469,922,589,081
  5. Step 5: Solve for x
    x = 469,922,589,081/320,520
  6. Step 6: Final answer
    x = 1,466,125.64

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.