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Finding the Fourth Proportional to 354.50, 489.21 and 238.27

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Solution

The fourth proportional to 354.50, 489.21 and 238.27 is: 328.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.50 : 489.21 = 238.27 : x
  2. Step 2: Convert to fraction form
    354.50/489.21 = 238.27/x
  3. Step 3: Cross multiply
    354.50x = 489.21 × 238.27
  4. Step 4: Simplify right side
    354.50x = 116,564.07
  5. Step 5: Solve for x
    x = 116,564.07/354.50
  6. Step 6: Final answer
    x = 328.81

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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.