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Finding the Fourth Proportional to 329.47, 494.20 and 221.74

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Solution

The fourth proportional to 329.47, 494.20 and 221.74 is: 332.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.47 : 494.20 = 221.74 : x
  2. Step 2: Convert to fraction form
    329.47/494.20 = 221.74/x
  3. Step 3: Cross multiply
    329.47x = 494.20 × 221.74
  4. Step 4: Simplify right side
    329.47x = 109,582.95
  5. Step 5: Solve for x
    x = 109,582.95/329.47
  6. Step 6: Final answer
    x = 332.61

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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.