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Finding the Fourth Proportional to 513.19, 769.98 and 220.75

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Solution

The fourth proportional to 513.19, 769.98 and 220.75 is: 331.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.19 : 769.98 = 220.75 : x
  2. Step 2: Convert to fraction form
    513.19/769.98 = 220.75/x
  3. Step 3: Cross multiply
    513.19x = 769.98 × 220.75
  4. Step 4: Simplify right side
    513.19x = 169,973.09
  5. Step 5: Solve for x
    x = 169,973.09/513.19
  6. Step 6: Final answer
    x = 331.21

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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.