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Finding the Third Proportional to 128,650,279 and 198,786,009

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Solution

The third proportional to 128,650,279 and 198,786,009 is: 307,157,339.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,650,279 : 198,786,009 = 198,786,009 : x
  2. Step 2: Convert to fraction form
    128,650,279/198,786,009 = 198,786,009/x
  3. Step 3: Cross multiply
    128,650,279x = 198,786,009 × 198,786,009
  4. Step 4: Simplify right side
    128,650,279x = 39,515,877,374,148,080
  5. Step 5: Solve for x
    x = 39,515,877,374,148,080/128,650,279
  6. Step 6: Final answer
    x = 307,157,339.12

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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.