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Finding the Fourth Proportional to 516.47, 774.09 and 238.78

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Solution

The fourth proportional to 516.47, 774.09 and 238.78 is: 357.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.47 : 774.09 = 238.78 : x
  2. Step 2: Convert to fraction form
    516.47/774.09 = 238.78/x
  3. Step 3: Cross multiply
    516.47x = 774.09 × 238.78
  4. Step 4: Simplify right side
    516.47x = 184,835.27
  5. Step 5: Solve for x
    x = 184,835.27/516.47
  6. Step 6: Final answer
    x = 357.88

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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.