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Finding the Fourth Proportional to 628,691,715.86, 861,310,723.89 and 605,128,493.88

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Solution

The fourth proportional to 628,691,715.86, 861,310,723.89 and 605,128,493.88 is: 829,028,994.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,691,715.86 : 861,310,723.89 = 605,128,493.88 : x
  2. Step 2: Convert to fraction form
    628,691,715.86/861,310,723.89 = 605,128,493.88/x
  3. Step 3: Cross multiply
    628,691,715.86x = 861,310,723.89 × 605,128,493.88
  4. Step 4: Simplify right side
    628,691,715.86x = 521,203,661,112,517,440
  5. Step 5: Solve for x
    x = 521,203,661,112,517,440/628,691,715.86
  6. Step 6: Final answer
    x = 829,028,994.61

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.