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Finding the Third Proportional to 128,809 and 282,012

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Solution

The third proportional to 128,809 and 282,012 is: 617,431.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,809 : 282,012 = 282,012 : x
  2. Step 2: Convert to fraction form
    128,809/282,012 = 282,012/x
  3. Step 3: Cross multiply
    128,809x = 282,012 × 282,012
  4. Step 4: Simplify right side
    128,809x = 79,530,768,144
  5. Step 5: Solve for x
    x = 79,530,768,144/128,809
  6. Step 6: Final answer
    x = 617,431.76

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.