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Finding the Fourth Proportional to 1,805.75, 2,709.71 and 779.75

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Solution

The fourth proportional to 1,805.75, 2,709.71 and 779.75 is: 1,170.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,805.75 : 2,709.71 = 779.75 : x
  2. Step 2: Convert to fraction form
    1,805.75/2,709.71 = 779.75/x
  3. Step 3: Cross multiply
    1,805.75x = 2,709.71 × 779.75
  4. Step 4: Simplify right side
    1,805.75x = 2,112,896.37
  5. Step 5: Solve for x
    x = 2,112,896.37/1,805.75
  6. Step 6: Final answer
    x = 1,170.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.