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Finding the Fourth Proportional to 355.00, 489.80 and 222.35

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Solution

The fourth proportional to 355.00, 489.80 and 222.35 is: 306.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.00 : 489.80 = 222.35 : x
  2. Step 2: Convert to fraction form
    355.00/489.80 = 222.35/x
  3. Step 3: Cross multiply
    355.00x = 489.80 × 222.35
  4. Step 4: Simplify right side
    355.00x = 108,905.92
  5. Step 5: Solve for x
    x = 108,905.92/355.00
  6. Step 6: Final answer
    x = 306.78

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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.