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Finding the Third Proportional to 129,205,890 and 198,598,365

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Solution

The third proportional to 129,205,890 and 198,598,365 is: 305,259,385.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,205,890 : 198,598,365 = 198,598,365 : x
  2. Step 2: Convert to fraction form
    129,205,890/198,598,365 = 198,598,365/x
  3. Step 3: Cross multiply
    129,205,890x = 198,598,365 × 198,598,365
  4. Step 4: Simplify right side
    129,205,890x = 39,441,310,580,673,224
  5. Step 5: Solve for x
    x = 39,441,310,580,673,224/129,205,890
  6. Step 6: Final answer
    x = 305,259,385.47

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.