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Finding the Fourth Proportional to 399,591.36, 551,380.32 and 388,839.36

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Solution

The fourth proportional to 399,591.36, 551,380.32 and 388,839.36 is: 536,544.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,591.36 : 551,380.32 = 388,839.36 : x
  2. Step 2: Convert to fraction form
    399,591.36/551,380.32 = 388,839.36/x
  3. Step 3: Cross multiply
    399,591.36x = 551,380.32 × 388,839.36
  4. Step 4: Simplify right side
    399,591.36x = 214,398,370,745.40
  5. Step 5: Solve for x
    x = 214,398,370,745.40/399,591.36
  6. Step 6: Final answer
    x = 536,544.06

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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.