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Finding the Fourth Proportional to 420,634.60, 629,915.10 and 279,629.80

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Solution

The fourth proportional to 420,634.60, 629,915.10 and 279,629.80 is: 418,755.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,634.60 : 629,915.10 = 279,629.80 : x
  2. Step 2: Convert to fraction form
    420,634.60/629,915.10 = 279,629.80/x
  3. Step 3: Cross multiply
    420,634.60x = 629,915.10 × 279,629.80
  4. Step 4: Simplify right side
    420,634.60x = 176,143,033,429.98
  5. Step 5: Solve for x
    x = 176,143,033,429.98/420,634.60
  6. Step 6: Final answer
    x = 418,755.46

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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.