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Finding the Fourth Proportional to 863.05, 1,190.80 and 489.94

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Solution

The fourth proportional to 863.05, 1,190.80 and 489.94 is: 676.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.05 : 1,190.80 = 489.94 : x
  2. Step 2: Convert to fraction form
    863.05/1,190.80 = 489.94/x
  3. Step 3: Cross multiply
    863.05x = 1,190.80 × 489.94
  4. Step 4: Simplify right side
    863.05x = 583,418.10
  5. Step 5: Solve for x
    x = 583,418.10/863.05
  6. Step 6: Final answer
    x = 676.00

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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.