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Finding the Fourth Proportional to 2,638.58, 3,956.70 and 789.08

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Solution

The fourth proportional to 2,638.58, 3,956.70 and 789.08 is: 1,183.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.58 : 3,956.70 = 789.08 : x
  2. Step 2: Convert to fraction form
    2,638.58/3,956.70 = 789.08/x
  3. Step 3: Cross multiply
    2,638.58x = 3,956.70 × 789.08
  4. Step 4: Simplify right side
    2,638.58x = 3,122,152.84
  5. Step 5: Solve for x
    x = 3,122,152.84/2,638.58
  6. Step 6: Final answer
    x = 1,183.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.