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Finding the Fourth Proportional to 412,672.20, 618,230.70 and 212,310.60

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Solution

The fourth proportional to 412,672.20, 618,230.70 and 212,310.60 is: 318,065.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    412,672.20 : 618,230.70 = 212,310.60 : x
  2. Step 2: Convert to fraction form
    412,672.20/618,230.70 = 212,310.60/x
  3. Step 3: Cross multiply
    412,672.20x = 618,230.70 × 212,310.60
  4. Step 4: Simplify right side
    412,672.20x = 131,256,930,855.42
  5. Step 5: Solve for x
    x = 131,256,930,855.42/412,672.20
  6. Step 6: Final answer
    x = 318,065.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.