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Finding the Fourth Proportional to 378.43, 521.30 and 329.22

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Solution

The fourth proportional to 378.43, 521.30 and 329.22 is: 453.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.43 : 521.30 = 329.22 : x
  2. Step 2: Convert to fraction form
    378.43/521.30 = 329.22/x
  3. Step 3: Cross multiply
    378.43x = 521.30 × 329.22
  4. Step 4: Simplify right side
    378.43x = 171,620.74
  5. Step 5: Solve for x
    x = 171,620.74/378.43
  6. Step 6: Final answer
    x = 453.51

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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.