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Finding the Fourth Proportional to 355.50, 490.60 and 217.50

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Solution

The fourth proportional to 355.50, 490.60 and 217.50 is: 300.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.50 : 490.60 = 217.50 : x
  2. Step 2: Convert to fraction form
    355.50/490.60 = 217.50/x
  3. Step 3: Cross multiply
    355.50x = 490.60 × 217.50
  4. Step 4: Simplify right side
    355.50x = 106,704.41
  5. Step 5: Solve for x
    x = 106,704.41/355.50
  6. Step 6: Final answer
    x = 300.15

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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.