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Finding the Fourth Proportional to 663.21, 995.94 and 408.33

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Solution

The fourth proportional to 663.21, 995.94 and 408.33 is: 613.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.21 : 995.94 = 408.33 : x
  2. Step 2: Convert to fraction form
    663.21/995.94 = 408.33/x
  3. Step 3: Cross multiply
    663.21x = 995.94 × 408.33
  4. Step 4: Simplify right side
    663.21x = 406,672.18
  5. Step 5: Solve for x
    x = 406,672.18/663.21
  6. Step 6: Final answer
    x = 613.19

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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.