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Finding the Fourth Proportional to 692.15, 1,038.45 and 326.96

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Solution

The fourth proportional to 692.15, 1,038.45 and 326.96 is: 490.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.15 : 1,038.45 = 326.96 : x
  2. Step 2: Convert to fraction form
    692.15/1,038.45 = 326.96/x
  3. Step 3: Cross multiply
    692.15x = 1,038.45 × 326.96
  4. Step 4: Simplify right side
    692.15x = 339,526.42
  5. Step 5: Solve for x
    x = 339,526.42/692.15
  6. Step 6: Final answer
    x = 490.54

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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.