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Finding the Fourth Proportional to 579.97, 799.81 and 391.34

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Solution

The fourth proportional to 579.97, 799.81 and 391.34 is: 539.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.97 : 799.81 = 391.34 : x
  2. Step 2: Convert to fraction form
    579.97/799.81 = 391.34/x
  3. Step 3: Cross multiply
    579.97x = 799.81 × 391.34
  4. Step 4: Simplify right side
    579.97x = 312,998.67
  5. Step 5: Solve for x
    x = 312,998.67/579.97
  6. Step 6: Final answer
    x = 539.68

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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.