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Finding the Fourth Proportional to 354.91, 489.81 and 197.60

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Solution

The fourth proportional to 354.91, 489.81 and 197.60 is: 272.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.91 : 489.81 = 197.60 : x
  2. Step 2: Convert to fraction form
    354.91/489.81 = 197.60/x
  3. Step 3: Cross multiply
    354.91x = 489.81 × 197.60
  4. Step 4: Simplify right side
    354.91x = 96,786.46
  5. Step 5: Solve for x
    x = 96,786.46/354.91
  6. Step 6: Final answer
    x = 272.71

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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.