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Finding the Fourth Proportional to 354.09, 488.79 and 221.34

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Solution

The fourth proportional to 354.09, 488.79 and 221.34 is: 305.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.09 : 488.79 = 221.34 : x
  2. Step 2: Convert to fraction form
    354.09/488.79 = 221.34/x
  3. Step 3: Cross multiply
    354.09x = 488.79 × 221.34
  4. Step 4: Simplify right side
    354.09x = 108,188.78
  5. Step 5: Solve for x
    x = 108,188.78/354.09
  6. Step 6: Final answer
    x = 305.54

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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.