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Finding the Fourth Proportional to 678,591.21, 936,530.73 and 388,229.70

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Solution

The fourth proportional to 678,591.21, 936,530.73 and 388,229.70 is: 535,799.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,591.21 : 936,530.73 = 388,229.70 : x
  2. Step 2: Convert to fraction form
    678,591.21/936,530.73 = 388,229.70/x
  3. Step 3: Cross multiply
    678,591.21x = 936,530.73 × 388,229.70
  4. Step 4: Simplify right side
    678,591.21x = 363,589,044,348.68
  5. Step 5: Solve for x
    x = 363,589,044,348.68/678,591.21
  6. Step 6: Final answer
    x = 535,799.81

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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.