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Finding the Fourth Proportional to 513.73, 770.90 and 205.53

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Solution

The fourth proportional to 513.73, 770.90 and 205.53 is: 308.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.73 : 770.90 = 205.53 : x
  2. Step 2: Convert to fraction form
    513.73/770.90 = 205.53/x
  3. Step 3: Cross multiply
    513.73x = 770.90 × 205.53
  4. Step 4: Simplify right side
    513.73x = 158,442.05
  5. Step 5: Solve for x
    x = 158,442.05/513.73
  6. Step 6: Final answer
    x = 308.42

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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.