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Finding the Fourth Proportional to 1,311.44, 1,809.79 and 721.97

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Solution

The fourth proportional to 1,311.44, 1,809.79 and 721.97 is: 996.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.44 : 1,809.79 = 721.97 : x
  2. Step 2: Convert to fraction form
    1,311.44/1,809.79 = 721.97/x
  3. Step 3: Cross multiply
    1,311.44x = 1,809.79 × 721.97
  4. Step 4: Simplify right side
    1,311.44x = 1,306,610.02
  5. Step 5: Solve for x
    x = 1,306,610.02/1,311.44
  6. Step 6: Final answer
    x = 996.32

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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.