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Finding the Third Proportional to 100,780 and 219,980

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Solution

The third proportional to 100,780 and 219,980 is: 480,166.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,780 : 219,980 = 219,980 : x
  2. Step 2: Convert to fraction form
    100,780/219,980 = 219,980/x
  3. Step 3: Cross multiply
    100,780x = 219,980 × 219,980
  4. Step 4: Simplify right side
    100,780x = 48,391,200,400
  5. Step 5: Solve for x
    x = 48,391,200,400/100,780
  6. Step 6: Final answer
    x = 480,166.70

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.