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Finding the Fourth Proportional to 691,571,343.86, 954,391,217.87 and 378,298,388.78

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Solution

The fourth proportional to 691,571,343.86, 954,391,217.87 and 378,298,388.78 is: 522,064,228.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,571,343.86 : 954,391,217.87 = 378,298,388.78 : x
  2. Step 2: Convert to fraction form
    691,571,343.86/954,391,217.87 = 378,298,388.78/x
  3. Step 3: Cross multiply
    691,571,343.86x = 954,391,217.87 × 378,298,388.78
  4. Step 4: Simplify right side
    691,571,343.86x = 361,044,659,986,002,944
  5. Step 5: Solve for x
    x = 361,044,659,986,002,944/691,571,343.86
  6. Step 6: Final answer
    x = 522,064,228.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.