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Finding the Fourth Proportional to 431,489.60, 647,234.40 and 274,414.40

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Solution

The fourth proportional to 431,489.60, 647,234.40 and 274,414.40 is: 411,621.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,489.60 : 647,234.40 = 274,414.40 : x
  2. Step 2: Convert to fraction form
    431,489.60/647,234.40 = 274,414.40/x
  3. Step 3: Cross multiply
    431,489.60x = 647,234.40 × 274,414.40
  4. Step 4: Simplify right side
    431,489.60x = 177,610,439,535.36
  5. Step 5: Solve for x
    x = 177,610,439,535.36/431,489.60
  6. Step 6: Final answer
    x = 411,621.60

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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.