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Finding the Fourth Proportional to 692.62, 1,039.21 and 259.81

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Solution

The fourth proportional to 692.62, 1,039.21 and 259.81 is: 389.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.62 : 1,039.21 = 259.81 : x
  2. Step 2: Convert to fraction form
    692.62/1,039.21 = 259.81/x
  3. Step 3: Cross multiply
    692.62x = 1,039.21 × 259.81
  4. Step 4: Simplify right side
    692.62x = 269,997.15
  5. Step 5: Solve for x
    x = 269,997.15/692.62
  6. Step 6: Final answer
    x = 389.82

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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.