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Finding the Fourth Proportional to 431,569,487.80, 647,354,231.70 and 395,856,652.60

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Solution

The fourth proportional to 431,569,487.80, 647,354,231.70 and 395,856,652.60 is: 593,784,978.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,569,487.80 : 647,354,231.70 = 395,856,652.60 : x
  2. Step 2: Convert to fraction form
    431,569,487.80/647,354,231.70 = 395,856,652.60/x
  3. Step 3: Cross multiply
    431,569,487.80x = 647,354,231.70 × 395,856,652.60
  4. Step 4: Simplify right side
    431,569,487.80x = 256,259,479,207,206,848
  5. Step 5: Solve for x
    x = 256,259,479,207,206,848/431,569,487.80
  6. Step 6: Final answer
    x = 593,784,978.90

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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.