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Finding the Fourth Proportional to 323.28, 445.16 and 289.56

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Solution

The fourth proportional to 323.28, 445.16 and 289.56 is: 398.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.28 : 445.16 = 289.56 : x
  2. Step 2: Convert to fraction form
    323.28/445.16 = 289.56/x
  3. Step 3: Cross multiply
    323.28x = 445.16 × 289.56
  4. Step 4: Simplify right side
    323.28x = 128,900.53
  5. Step 5: Solve for x
    x = 128,900.53/323.28
  6. Step 6: Final answer
    x = 398.73

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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.