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Finding the Fourth Proportional to 379,679,662.88, 523,978,278.88 and 212,405,945.48

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Solution

The fourth proportional to 379,679,662.88, 523,978,278.88 and 212,405,945.48 is: 293,131,585.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    379,679,662.88 : 523,978,278.88 = 212,405,945.48 : x
  2. Step 2: Convert to fraction form
    379,679,662.88/523,978,278.88 = 212,405,945.48/x
  3. Step 3: Cross multiply
    379,679,662.88x = 523,978,278.88 × 212,405,945.48
  4. Step 4: Simplify right side
    379,679,662.88x = 111,296,101,736,489,504
  5. Step 5: Solve for x
    x = 111,296,101,736,489,504/379,679,662.88
  6. Step 6: Final answer
    x = 293,131,585.96

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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.