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Finding the Fourth Proportional to 329.20, 493.79 and 221.67

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Solution

The fourth proportional to 329.20, 493.79 and 221.67 is: 332.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.20 : 493.79 = 221.67 : x
  2. Step 2: Convert to fraction form
    329.20/493.79 = 221.67/x
  3. Step 3: Cross multiply
    329.20x = 493.79 × 221.67
  4. Step 4: Simplify right side
    329.20x = 109,457.32
  5. Step 5: Solve for x
    x = 109,457.32/329.20
  6. Step 6: Final answer
    x = 332.50

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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.