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Finding the Fourth Proportional to 354.34, 489.05 and 221.62

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Solution

The fourth proportional to 354.34, 489.05 and 221.62 is: 305.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.34 : 489.05 = 221.62 : x
  2. Step 2: Convert to fraction form
    354.34/489.05 = 221.62/x
  3. Step 3: Cross multiply
    354.34x = 489.05 × 221.62
  4. Step 4: Simplify right side
    354.34x = 108,383.26
  5. Step 5: Solve for x
    x = 108,383.26/354.34
  6. Step 6: Final answer
    x = 305.87

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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.