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Finding the Fourth Proportional to 431,704.70, 647,557.05 and 428,939.90

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Solution

The fourth proportional to 431,704.70, 647,557.05 and 428,939.90 is: 643,409.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,704.70 : 647,557.05 = 428,939.90 : x
  2. Step 2: Convert to fraction form
    431,704.70/647,557.05 = 428,939.90/x
  3. Step 3: Cross multiply
    431,704.70x = 647,557.05 × 428,939.90
  4. Step 4: Simplify right side
    431,704.70x = 277,763,056,271.30
  5. Step 5: Solve for x
    x = 277,763,056,271.30/431,704.70
  6. Step 6: Final answer
    x = 643,409.85

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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.