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Finding the Fourth Proportional to 431,644.80, 647,467.20 and 405,379.20

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Solution

The fourth proportional to 431,644.80, 647,467.20 and 405,379.20 is: 608,068.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,644.80 : 647,467.20 = 405,379.20 : x
  2. Step 2: Convert to fraction form
    431,644.80/647,467.20 = 405,379.20/x
  3. Step 3: Cross multiply
    431,644.80x = 647,467.20 × 405,379.20
  4. Step 4: Simplify right side
    431,644.80x = 262,469,735,562.24
  5. Step 5: Solve for x
    x = 262,469,735,562.24/431,644.80
  6. Step 6: Final answer
    x = 608,068.80

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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.