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Finding the Fourth Proportional to 388,940.80, 536,738.64 and 210,092.80

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Solution

The fourth proportional to 388,940.80, 536,738.64 and 210,092.80 is: 289,928.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,940.80 : 536,738.64 = 210,092.80 : x
  2. Step 2: Convert to fraction form
    388,940.80/536,738.64 = 210,092.80/x
  3. Step 3: Cross multiply
    388,940.80x = 536,738.64 × 210,092.80
  4. Step 4: Simplify right side
    388,940.80x = 112,764,923,745.79
  5. Step 5: Solve for x
    x = 112,764,923,745.79/388,940.80
  6. Step 6: Final answer
    x = 289,928.25

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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.