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Finding the Fourth Proportional to 355.30, 490.40 and 222.60

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Solution

The fourth proportional to 355.30, 490.40 and 222.60 is: 307.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.30 : 490.40 = 222.60 : x
  2. Step 2: Convert to fraction form
    355.30/490.40 = 222.60/x
  3. Step 3: Cross multiply
    355.30x = 490.40 × 222.60
  4. Step 4: Simplify right side
    355.30x = 109,163.04
  5. Step 5: Solve for x
    x = 109,163.04/355.30
  6. Step 6: Final answer
    x = 307.24

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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.