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Finding the Fourth Proportional to 379,679,660.28, 523,978,275.15 and 212,405,942.88

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Solution

The fourth proportional to 379,679,660.28, 523,978,275.15 and 212,405,942.88 is: 293,131,582.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    379,679,660.28 : 523,978,275.15 = 212,405,942.88 : x
  2. Step 2: Convert to fraction form
    379,679,660.28/523,978,275.15 = 212,405,942.88/x
  3. Step 3: Cross multiply
    379,679,660.28x = 523,978,275.15 × 212,405,942.88
  4. Step 4: Simplify right side
    379,679,660.28x = 111,296,099,581,871,808
  5. Step 5: Solve for x
    x = 111,296,099,581,871,808/379,679,660.28
  6. Step 6: Final answer
    x = 293,131,582.29

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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.