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Finding the Fourth Proportional to 571.92, 789.21 and 339

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Solution

The fourth proportional to 571.92, 789.21 and 339 is: 467.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.92 : 789.21 = 339 : x
  2. Step 2: Convert to fraction form
    571.92/789.21 = 339/x
  3. Step 3: Cross multiply
    571.92x = 789.21 × 339
  4. Step 4: Simplify right side
    571.92x = 267,542.19
  5. Step 5: Solve for x
    x = 267,542.19/571.92
  6. Step 6: Final answer
    x = 467.80

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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.