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Finding the Fourth Proportional to 1,226.49, 1,692.78 and 729.30

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Solution

The fourth proportional to 1,226.49, 1,692.78 and 729.30 is: 1,006.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.49 : 1,692.78 = 729.30 : x
  2. Step 2: Convert to fraction form
    1,226.49/1,692.78 = 729.30/x
  3. Step 3: Cross multiply
    1,226.49x = 1,692.78 × 729.30
  4. Step 4: Simplify right side
    1,226.49x = 1,234,544.45
  5. Step 5: Solve for x
    x = 1,234,544.45/1,226.49
  6. Step 6: Final answer
    x = 1,006.57

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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.