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Finding the Fourth Proportional to 516.57, 774.90 and 169.80

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Solution

The fourth proportional to 516.57, 774.90 and 169.80 is: 254.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.57 : 774.90 = 169.80 : x
  2. Step 2: Convert to fraction form
    516.57/774.90 = 169.80/x
  3. Step 3: Cross multiply
    516.57x = 774.90 × 169.80
  4. Step 4: Simplify right side
    516.57x = 131,578.02
  5. Step 5: Solve for x
    x = 131,578.02/516.57
  6. Step 6: Final answer
    x = 254.71

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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.