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Finding the Fourth Proportional to 1,226.73, 1,692.90 and 667.21

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Solution

The fourth proportional to 1,226.73, 1,692.90 and 667.21 is: 920.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.73 : 1,692.90 = 667.21 : x
  2. Step 2: Convert to fraction form
    1,226.73/1,692.90 = 667.21/x
  3. Step 3: Cross multiply
    1,226.73x = 1,692.90 × 667.21
  4. Step 4: Simplify right side
    1,226.73x = 1,129,518.14
  5. Step 5: Solve for x
    x = 1,129,518.14/1,226.73
  6. Step 6: Final answer
    x = 920.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.