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Finding the Fourth Proportional to 516.49, 774.86 and 191.88

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Solution

The fourth proportional to 516.49, 774.86 and 191.88 is: 287.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.49 : 774.86 = 191.88 : x
  2. Step 2: Convert to fraction form
    516.49/774.86 = 191.88/x
  3. Step 3: Cross multiply
    516.49x = 774.86 × 191.88
  4. Step 4: Simplify right side
    516.49x = 148,680.14
  5. Step 5: Solve for x
    x = 148,680.14/516.49
  6. Step 6: Final answer
    x = 287.87

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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.