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Finding the Fourth Proportional to 329.61, 454.85 and 189.75

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Solution

The fourth proportional to 329.61, 454.85 and 189.75 is: 261.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.61 : 454.85 = 189.75 : x
  2. Step 2: Convert to fraction form
    329.61/454.85 = 189.75/x
  3. Step 3: Cross multiply
    329.61x = 454.85 × 189.75
  4. Step 4: Simplify right side
    329.61x = 86,306.84
  5. Step 5: Solve for x
    x = 86,306.84/329.61
  6. Step 6: Final answer
    x = 261.85

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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.