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Finding the Fourth Proportional to 392.44, 541.56 and 217.78

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Solution

The fourth proportional to 392.44, 541.56 and 217.78 is: 300.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.44 : 541.56 = 217.78 : x
  2. Step 2: Convert to fraction form
    392.44/541.56 = 217.78/x
  3. Step 3: Cross multiply
    392.44x = 541.56 × 217.78
  4. Step 4: Simplify right side
    392.44x = 117,940.94
  5. Step 5: Solve for x
    x = 117,940.94/392.44
  6. Step 6: Final answer
    x = 300.53

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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.