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Finding the Fourth Proportional to 393.72, 544.32 and 331.56

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Solution

The fourth proportional to 393.72, 544.32 and 331.56 is: 458.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.72 : 544.32 = 331.56 : x
  2. Step 2: Convert to fraction form
    393.72/544.32 = 331.56/x
  3. Step 3: Cross multiply
    393.72x = 544.32 × 331.56
  4. Step 4: Simplify right side
    393.72x = 180,474.74
  5. Step 5: Solve for x
    x = 180,474.74/393.72
  6. Step 6: Final answer
    x = 458.38

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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.