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Finding the Fourth Proportional to 692.83, 1,039.70 and 511.49

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Solution

The fourth proportional to 692.83, 1,039.70 and 511.49 is: 767.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.83 : 1,039.70 = 511.49 : x
  2. Step 2: Convert to fraction form
    692.83/1,039.70 = 511.49/x
  3. Step 3: Cross multiply
    692.83x = 1,039.70 × 511.49
  4. Step 4: Simplify right side
    692.83x = 531,796.15
  5. Step 5: Solve for x
    x = 531,796.15/692.83
  6. Step 6: Final answer
    x = 767.57

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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.