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Finding the Third Proportional to 138,720 and 214,704

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Solution

The third proportional to 138,720 and 214,704 is: 332,308.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,720 : 214,704 = 214,704 : x
  2. Step 2: Convert to fraction form
    138,720/214,704 = 214,704/x
  3. Step 3: Cross multiply
    138,720x = 214,704 × 214,704
  4. Step 4: Simplify right side
    138,720x = 46,097,807,616
  5. Step 5: Solve for x
    x = 46,097,807,616/138,720
  6. Step 6: Final answer
    x = 332,308.30

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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.