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Finding the Third Proportional to 128,650,280 and 198,786,011

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Solution

The third proportional to 128,650,280 and 198,786,011 is: 307,157,342.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,650,280 : 198,786,011 = 198,786,011 : x
  2. Step 2: Convert to fraction form
    128,650,280/198,786,011 = 198,786,011/x
  3. Step 3: Cross multiply
    128,650,280x = 198,786,011 × 198,786,011
  4. Step 4: Simplify right side
    128,650,280x = 39,515,878,169,292,120
  5. Step 5: Solve for x
    x = 39,515,878,169,292,120/128,650,280
  6. Step 6: Final answer
    x = 307,157,342.91

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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.