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Finding the Fourth Proportional to 354.22, 489.07 and 221.50

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Solution

The fourth proportional to 354.22, 489.07 and 221.50 is: 305.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.22 : 489.07 = 221.50 : x
  2. Step 2: Convert to fraction form
    354.22/489.07 = 221.50/x
  3. Step 3: Cross multiply
    354.22x = 489.07 × 221.50
  4. Step 4: Simplify right side
    354.22x = 108,329.89
  5. Step 5: Solve for x
    x = 108,329.89/354.22
  6. Step 6: Final answer
    x = 305.82

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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.