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Finding the Fourth Proportional to 863.45, 1,190.78 and 579.98

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Solution

The fourth proportional to 863.45, 1,190.78 and 579.98 is: 799.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.45 : 1,190.78 = 579.98 : x
  2. Step 2: Convert to fraction form
    863.45/1,190.78 = 579.98/x
  3. Step 3: Cross multiply
    863.45x = 1,190.78 × 579.98
  4. Step 4: Simplify right side
    863.45x = 690,619.73
  5. Step 5: Solve for x
    x = 690,619.73/863.45
  6. Step 6: Final answer
    x = 799.84

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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.