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Finding the Fourth Proportional to 355.07, 489.98 and 197.71

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Solution

The fourth proportional to 355.07, 489.98 and 197.71 is: 272.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.07 : 489.98 = 197.71 : x
  2. Step 2: Convert to fraction form
    355.07/489.98 = 197.71/x
  3. Step 3: Cross multiply
    355.07x = 489.98 × 197.71
  4. Step 4: Simplify right side
    355.07x = 96,873.22
  5. Step 5: Solve for x
    x = 96,873.22/355.07
  6. Step 6: Final answer
    x = 272.83

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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.