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Finding the Fourth Proportional to 543.54, 815.22 and 218.60

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Solution

The fourth proportional to 543.54, 815.22 and 218.60 is: 327.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.54 : 815.22 = 218.60 : x
  2. Step 2: Convert to fraction form
    543.54/815.22 = 218.60/x
  3. Step 3: Cross multiply
    543.54x = 815.22 × 218.60
  4. Step 4: Simplify right side
    543.54x = 178,207.09
  5. Step 5: Solve for x
    x = 178,207.09/543.54
  6. Step 6: Final answer
    x = 327.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.