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Finding the Fourth Proportional to 354.87, 489.71 and 197.50

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Solution

The fourth proportional to 354.87, 489.71 and 197.50 is: 272.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.87 : 489.71 = 197.50 : x
  2. Step 2: Convert to fraction form
    354.87/489.71 = 197.50/x
  3. Step 3: Cross multiply
    354.87x = 489.71 × 197.50
  4. Step 4: Simplify right side
    354.87x = 96,717.73
  5. Step 5: Solve for x
    x = 96,717.73/354.87
  6. Step 6: Final answer
    x = 272.54

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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.