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Finding the Fourth Proportional to 388,299.28, 535,764.36 and 218,471.44

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Solution

The fourth proportional to 388,299.28, 535,764.36 and 218,471.44 is: 301,440.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,299.28 : 535,764.36 = 218,471.44 : x
  2. Step 2: Convert to fraction form
    388,299.28/535,764.36 = 218,471.44/x
  3. Step 3: Cross multiply
    388,299.28x = 535,764.36 × 218,471.44
  4. Step 4: Simplify right side
    388,299.28x = 117,049,211,229.88
  5. Step 5: Solve for x
    x = 117,049,211,229.88/388,299.28
  6. Step 6: Final answer
    x = 301,440.71

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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.