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Finding the Third Proportional to 128,788 and 197,009

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Solution

The third proportional to 128,788 and 197,009 is: 301,367.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,788 : 197,009 = 197,009 : x
  2. Step 2: Convert to fraction form
    128,788/197,009 = 197,009/x
  3. Step 3: Cross multiply
    128,788x = 197,009 × 197,009
  4. Step 4: Simplify right side
    128,788x = 38,812,546,081
  5. Step 5: Solve for x
    x = 38,812,546,081/128,788
  6. Step 6: Final answer
    x = 301,367.72

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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.