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Finding the Fourth Proportional to 517.14, 774.45 and 321.66

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Solution

The fourth proportional to 517.14, 774.45 and 321.66 is: 481.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.14 : 774.45 = 321.66 : x
  2. Step 2: Convert to fraction form
    517.14/774.45 = 321.66/x
  3. Step 3: Cross multiply
    517.14x = 774.45 × 321.66
  4. Step 4: Simplify right side
    517.14x = 249,109.59
  5. Step 5: Solve for x
    x = 249,109.59/517.14
  6. Step 6: Final answer
    x = 481.71

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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.