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Finding the Fourth Proportional to 378.26, 521.90 and 329.06

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Solution

The fourth proportional to 378.26, 521.90 and 329.06 is: 454.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.26 : 521.90 = 329.06 : x
  2. Step 2: Convert to fraction form
    378.26/521.90 = 329.06/x
  3. Step 3: Cross multiply
    378.26x = 521.90 × 329.06
  4. Step 4: Simplify right side
    378.26x = 171,736.41
  5. Step 5: Solve for x
    x = 171,736.41/378.26
  6. Step 6: Final answer
    x = 454.02

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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.