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Finding the Fourth Proportional to 379,679,660.88, 523,978,276.12 and 212,405,943.48

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Solution

The fourth proportional to 379,679,660.88, 523,978,276.12 and 212,405,943.48 is: 293,131,583.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    379,679,660.88 : 523,978,276.12 = 212,405,943.48 : x
  2. Step 2: Convert to fraction form
    379,679,660.88/523,978,276.12 = 212,405,943.48/x
  3. Step 3: Cross multiply
    379,679,660.88x = 523,978,276.12 × 212,405,943.48
  4. Step 4: Simplify right side
    379,679,660.88x = 111,296,100,102,292,544
  5. Step 5: Solve for x
    x = 111,296,100,102,292,544/379,679,660.88
  6. Step 6: Final answer
    x = 293,131,583.20

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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.