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Finding the Fourth Proportional to 692.58, 1,038.86 and 327.11

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Solution

The fourth proportional to 692.58, 1,038.86 and 327.11 is: 490.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.58 : 1,038.86 = 327.11 : x
  2. Step 2: Convert to fraction form
    692.58/1,038.86 = 327.11/x
  3. Step 3: Cross multiply
    692.58x = 1,038.86 × 327.11
  4. Step 4: Simplify right side
    692.58x = 339,815.89
  5. Step 5: Solve for x
    x = 339,815.89/692.58
  6. Step 6: Final answer
    x = 490.65

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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.