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Finding the Fourth Proportional to 692.70, 1,036.92 and 518.36

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Solution

The fourth proportional to 692.70, 1,036.92 and 518.36 is: 775.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.70 : 1,036.92 = 518.36 : x
  2. Step 2: Convert to fraction form
    692.70/1,036.92 = 518.36/x
  3. Step 3: Cross multiply
    692.70x = 1,036.92 × 518.36
  4. Step 4: Simplify right side
    692.70x = 537,497.85
  5. Step 5: Solve for x
    x = 537,497.85/692.70
  6. Step 6: Final answer
    x = 775.95

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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.