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Finding the Fourth Proportional to 2,692.47, 4,039.50 and 843.78

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Solution

The fourth proportional to 2,692.47, 4,039.50 and 843.78 is: 1,265.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,692.47 : 4,039.50 = 843.78 : x
  2. Step 2: Convert to fraction form
    2,692.47/4,039.50 = 843.78/x
  3. Step 3: Cross multiply
    2,692.47x = 4,039.50 × 843.78
  4. Step 4: Simplify right side
    2,692.47x = 3,408,449.31
  5. Step 5: Solve for x
    x = 3,408,449.31/2,692.47
  6. Step 6: Final answer
    x = 1,265.92

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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.