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Finding the Fourth Proportional to 516.69, 774.54 and 191.81

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Solution

The fourth proportional to 516.69, 774.54 and 191.81 is: 287.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.69 : 774.54 = 191.81 : x
  2. Step 2: Convert to fraction form
    516.69/774.54 = 191.81/x
  3. Step 3: Cross multiply
    516.69x = 774.54 × 191.81
  4. Step 4: Simplify right side
    516.69x = 148,566.45
  5. Step 5: Solve for x
    x = 148,566.45/516.69
  6. Step 6: Final answer
    x = 287.53

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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.