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Finding the Fourth Proportional to 399,591.86, 551,381.01 and 388,839.86

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Solution

The fourth proportional to 399,591.86, 551,381.01 and 388,839.86 is: 536,544.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,591.86 : 551,381.01 = 388,839.86 : x
  2. Step 2: Convert to fraction form
    399,591.86/551,381.01 = 388,839.86/x
  3. Step 3: Cross multiply
    399,591.86x = 551,381.01 × 388,839.86
  4. Step 4: Simplify right side
    399,591.86x = 214,398,914,735.06
  5. Step 5: Solve for x
    x = 214,398,914,735.06/399,591.86
  6. Step 6: Final answer
    x = 536,544.75

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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.