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Finding the Fourth Proportional to 516.61, 774.78 and 204.21

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Solution

The fourth proportional to 516.61, 774.78 and 204.21 is: 306.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.61 : 774.78 = 204.21 : x
  2. Step 2: Convert to fraction form
    516.61/774.78 = 204.21/x
  3. Step 3: Cross multiply
    516.61x = 774.78 × 204.21
  4. Step 4: Simplify right side
    516.61x = 158,217.06
  5. Step 5: Solve for x
    x = 158,217.06/516.61
  6. Step 6: Final answer
    x = 306.26

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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.