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Finding the Third Proportional to 692.72 and 1,377.84

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Solution

The third proportional to 692.72 and 1,377.84 is: 2,740.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.72 : 1,377.84 = 1,377.84 : x
  2. Step 2: Convert to fraction form
    692.72/1,377.84 = 1,377.84/x
  3. Step 3: Cross multiply
    692.72x = 1,377.84 × 1,377.84
  4. Step 4: Simplify right side
    692.72x = 1,898,453.40
  5. Step 5: Solve for x
    x = 1,898,453.40/692.72
  6. Step 6: Final answer
    x = 2,740.58

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Why These Related Problems?

These problems maintain the same ratio (1.99) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.