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Finding the Fourth Proportional to 351.55, 485.09 and 218.80

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Solution

The fourth proportional to 351.55, 485.09 and 218.80 is: 301.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.55 : 485.09 = 218.80 : x
  2. Step 2: Convert to fraction form
    351.55/485.09 = 218.80/x
  3. Step 3: Cross multiply
    351.55x = 485.09 × 218.80
  4. Step 4: Simplify right side
    351.55x = 106,137.69
  5. Step 5: Solve for x
    x = 106,137.69/351.55
  6. Step 6: Final answer
    x = 301.91

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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.