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Finding the Fourth Proportional to 571.99, 789.39 and 319.94

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Solution

The fourth proportional to 571.99, 789.39 and 319.94 is: 441.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.99 : 789.39 = 319.94 : x
  2. Step 2: Convert to fraction form
    571.99/789.39 = 319.94/x
  3. Step 3: Cross multiply
    571.99x = 789.39 × 319.94
  4. Step 4: Simplify right side
    571.99x = 252,556.45
  5. Step 5: Solve for x
    x = 252,556.45/571.99
  6. Step 6: Final answer
    x = 441.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.