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Finding the Fourth Proportional to 663.41, 995.21 and 218.54

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Solution

The fourth proportional to 663.41, 995.21 and 218.54 is: 327.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.41 : 995.21 = 218.54 : x
  2. Step 2: Convert to fraction form
    663.41/995.21 = 218.54/x
  3. Step 3: Cross multiply
    663.41x = 995.21 × 218.54
  4. Step 4: Simplify right side
    663.41x = 217,493.19
  5. Step 5: Solve for x
    x = 217,493.19/663.41
  6. Step 6: Final answer
    x = 327.84

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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.