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Finding the Fourth Proportional to 692.55, 1,039.74 and 539.46

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Solution

The fourth proportional to 692.55, 1,039.74 and 539.46 is: 809.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.55 : 1,039.74 = 539.46 : x
  2. Step 2: Convert to fraction form
    692.55/1,039.74 = 539.46/x
  3. Step 3: Cross multiply
    692.55x = 1,039.74 × 539.46
  4. Step 4: Simplify right side
    692.55x = 560,896.12
  5. Step 5: Solve for x
    x = 560,896.12/692.55
  6. Step 6: Final answer
    x = 809.90

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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.