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Finding the Fourth Proportional to 419,857.60, 629,383.20 and 139,230.40

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Solution

The fourth proportional to 419,857.60, 629,383.20 and 139,230.40 is: 208,711.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,857.60 : 629,383.20 = 139,230.40 : x
  2. Step 2: Convert to fraction form
    419,857.60/629,383.20 = 139,230.40/x
  3. Step 3: Cross multiply
    419,857.60x = 629,383.20 × 139,230.40
  4. Step 4: Simplify right side
    419,857.60x = 87,629,274,689.28
  5. Step 5: Solve for x
    x = 87,629,274,689.28/419,857.60
  6. Step 6: Final answer
    x = 208,711.89

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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.