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Finding the Third Proportional to 128,718 and 196,905

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Solution

The third proportional to 128,718 and 196,905 is: 301,213.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,718 : 196,905 = 196,905 : x
  2. Step 2: Convert to fraction form
    128,718/196,905 = 196,905/x
  3. Step 3: Cross multiply
    128,718x = 196,905 × 196,905
  4. Step 4: Simplify right side
    128,718x = 38,771,579,025
  5. Step 5: Solve for x
    x = 38,771,579,025/128,718
  6. Step 6: Final answer
    x = 301,213.34

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.