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Finding the Fourth Proportional to 513.94, 770.31 and 221.37

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Solution

The fourth proportional to 513.94, 770.31 and 221.37 is: 331.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.94 : 770.31 = 221.37 : x
  2. Step 2: Convert to fraction form
    513.94/770.31 = 221.37/x
  3. Step 3: Cross multiply
    513.94x = 770.31 × 221.37
  4. Step 4: Simplify right side
    513.94x = 170,523.52
  5. Step 5: Solve for x
    x = 170,523.52/513.94
  6. Step 6: Final answer
    x = 331.80

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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.