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Finding the Fourth Proportional to 323.41, 445.78 and 257.29

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Solution

The fourth proportional to 323.41, 445.78 and 257.29 is: 354.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.41 : 445.78 = 257.29 : x
  2. Step 2: Convert to fraction form
    323.41/445.78 = 257.29/x
  3. Step 3: Cross multiply
    323.41x = 445.78 × 257.29
  4. Step 4: Simplify right side
    323.41x = 114,694.74
  5. Step 5: Solve for x
    x = 114,694.74/323.41
  6. Step 6: Final answer
    x = 354.64

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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.