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Finding the Fourth Proportional to 355.08, 489.86 and 217

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Solution

The fourth proportional to 355.08, 489.86 and 217 is: 299.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.08 : 489.86 = 217 : x
  2. Step 2: Convert to fraction form
    355.08/489.86 = 217/x
  3. Step 3: Cross multiply
    355.08x = 489.86 × 217
  4. Step 4: Simplify right side
    355.08x = 106,299.62
  5. Step 5: Solve for x
    x = 106,299.62/355.08
  6. Step 6: Final answer
    x = 299.37

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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.