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Finding the Fourth Proportional to 722,138, 996,469.94 and 399,767.36

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Solution

The fourth proportional to 722,138, 996,469.94 and 399,767.36 is: 551,634.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,138 : 996,469.94 = 399,767.36 : x
  2. Step 2: Convert to fraction form
    722,138/996,469.94 = 399,767.36/x
  3. Step 3: Cross multiply
    722,138x = 996,469.94 × 399,767.36
  4. Step 4: Simplify right side
    722,138x = 398,356,157,233.16
  5. Step 5: Solve for x
    x = 398,356,157,233.16/722,138
  6. Step 6: Final answer
    x = 551,634.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.