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Finding the Fourth Proportional to 1,226.79, 1,692.98 and 667.27

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Solution

The fourth proportional to 1,226.79, 1,692.98 and 667.27 is: 920.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.79 : 1,692.98 = 667.27 : x
  2. Step 2: Convert to fraction form
    1,226.79/1,692.98 = 667.27/x
  3. Step 3: Cross multiply
    1,226.79x = 1,692.98 × 667.27
  4. Step 4: Simplify right side
    1,226.79x = 1,129,680.67
  5. Step 5: Solve for x
    x = 1,129,680.67/1,226.79
  6. Step 6: Final answer
    x = 920.84

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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.