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Finding the Fourth Proportional to 329.40, 454.49 and 189.55

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Solution

The fourth proportional to 329.40, 454.49 and 189.55 is: 261.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.40 : 454.49 = 189.55 : x
  2. Step 2: Convert to fraction form
    329.40/454.49 = 189.55/x
  3. Step 3: Cross multiply
    329.40x = 454.49 × 189.55
  4. Step 4: Simplify right side
    329.40x = 86,149.66
  5. Step 5: Solve for x
    x = 86,149.66/329.40
  6. Step 6: Final answer
    x = 261.54

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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.