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Finding the Fourth Proportional to 419,940.40, 629,910.60 and 251,978.80

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Solution

The fourth proportional to 419,940.40, 629,910.60 and 251,978.80 is: 377,968.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,940.40 : 629,910.60 = 251,978.80 : x
  2. Step 2: Convert to fraction form
    419,940.40/629,910.60 = 251,978.80/x
  3. Step 3: Cross multiply
    419,940.40x = 629,910.60 × 251,978.80
  4. Step 4: Simplify right side
    419,940.40x = 158,724,117,095.28
  5. Step 5: Solve for x
    x = 158,724,117,095.28/419,940.40
  6. Step 6: Final answer
    x = 377,968.20

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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.