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Finding the Fourth Proportional to 354.39, 489.01 and 221.41

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Solution

The fourth proportional to 354.39, 489.01 and 221.41 is: 305.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.39 : 489.01 = 221.41 : x
  2. Step 2: Convert to fraction form
    354.39/489.01 = 221.41/x
  3. Step 3: Cross multiply
    354.39x = 489.01 × 221.41
  4. Step 4: Simplify right side
    354.39x = 108,271.70
  5. Step 5: Solve for x
    x = 108,271.70/354.39
  6. Step 6: Final answer
    x = 305.52

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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.