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Finding the Fourth Proportional to 692.87, 1,039.16 and 205.86

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Solution

The fourth proportional to 692.87, 1,039.16 and 205.86 is: 308.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.87 : 1,039.16 = 205.86 : x
  2. Step 2: Convert to fraction form
    692.87/1,039.16 = 205.86/x
  3. Step 3: Cross multiply
    692.87x = 1,039.16 × 205.86
  4. Step 4: Simplify right side
    692.87x = 213,920.45
  5. Step 5: Solve for x
    x = 213,920.45/692.87
  6. Step 6: Final answer
    x = 308.75

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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.