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Finding the Fourth Proportional to 692.26, 1,038.55 and 399.90

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Solution

The fourth proportional to 692.26, 1,038.55 and 399.90 is: 599.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.26 : 1,038.55 = 399.90 : x
  2. Step 2: Convert to fraction form
    692.26/1,038.55 = 399.90/x
  3. Step 3: Cross multiply
    692.26x = 1,038.55 × 399.90
  4. Step 4: Simplify right side
    692.26x = 415,316.15
  5. Step 5: Solve for x
    x = 415,316.15/692.26
  6. Step 6: Final answer
    x = 599.94

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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.