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Finding the Fourth Proportional to 329.94, 494.70 and 221.40

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Solution

The fourth proportional to 329.94, 494.70 and 221.40 is: 331.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.94 : 494.70 = 221.40 : x
  2. Step 2: Convert to fraction form
    329.94/494.70 = 221.40/x
  3. Step 3: Cross multiply
    329.94x = 494.70 × 221.40
  4. Step 4: Simplify right side
    329.94x = 109,526.58
  5. Step 5: Solve for x
    x = 109,526.58/329.94
  6. Step 6: Final answer
    x = 331.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.