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Finding the Fourth Proportional to 1,227.29, 1,692.50 and 806.90

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Solution

The fourth proportional to 1,227.29, 1,692.50 and 806.90 is: 1,112.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.29 : 1,692.50 = 806.90 : x
  2. Step 2: Convert to fraction form
    1,227.29/1,692.50 = 806.90/x
  3. Step 3: Cross multiply
    1,227.29x = 1,692.50 × 806.90
  4. Step 4: Simplify right side
    1,227.29x = 1,365,665.75
  5. Step 5: Solve for x
    x = 1,365,665.75/1,227.29
  6. Step 6: Final answer
    x = 1,112.75

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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.