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Finding the Fourth Proportional to 1,205.21, 1,661.20 and 806.73

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Solution

The fourth proportional to 1,205.21, 1,661.20 and 806.73 is: 1,111.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.21 : 1,661.20 = 806.73 : x
  2. Step 2: Convert to fraction form
    1,205.21/1,661.20 = 806.73/x
  3. Step 3: Cross multiply
    1,205.21x = 1,661.20 × 806.73
  4. Step 4: Simplify right side
    1,205.21x = 1,340,135.72
  5. Step 5: Solve for x
    x = 1,340,135.72/1,205.21
  6. Step 6: Final answer
    x = 1,111.95

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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.