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Finding the Fourth Proportional to 692.66, 1,039.32 and 281.80

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Solution

The fourth proportional to 692.66, 1,039.32 and 281.80 is: 422.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.66 : 1,039.32 = 281.80 : x
  2. Step 2: Convert to fraction form
    692.66/1,039.32 = 281.80/x
  3. Step 3: Cross multiply
    692.66x = 1,039.32 × 281.80
  4. Step 4: Simplify right side
    692.66x = 292,880.38
  5. Step 5: Solve for x
    x = 292,880.38/692.66
  6. Step 6: Final answer
    x = 422.83

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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.