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Finding the Fourth Proportional to 692.87, 1,039.37 and 205.92

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Solution

The fourth proportional to 692.87, 1,039.37 and 205.92 is: 308.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.87 : 1,039.37 = 205.92 : x
  2. Step 2: Convert to fraction form
    692.87/1,039.37 = 205.92/x
  3. Step 3: Cross multiply
    692.87x = 1,039.37 × 205.92
  4. Step 4: Simplify right side
    692.87x = 214,026.04
  5. Step 5: Solve for x
    x = 214,026.04/692.87
  6. Step 6: Final answer
    x = 308.90

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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.