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Finding the Fourth Proportional to 1,216.75, 1,679.86 and 791.78

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Solution

The fourth proportional to 1,216.75, 1,679.86 and 791.78 is: 1,093.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.75 : 1,679.86 = 791.78 : x
  2. Step 2: Convert to fraction form
    1,216.75/1,679.86 = 791.78/x
  3. Step 3: Cross multiply
    1,216.75x = 1,679.86 × 791.78
  4. Step 4: Simplify right side
    1,216.75x = 1,330,073.37
  5. Step 5: Solve for x
    x = 1,330,073.37/1,216.75
  6. Step 6: Final answer
    x = 1,093.14

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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.