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Finding the Fourth Proportional to 1,361.36, 1,879.07 and 919.82

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Solution

The fourth proportional to 1,361.36, 1,879.07 and 919.82 is: 1,269.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.36 : 1,879.07 = 919.82 : x
  2. Step 2: Convert to fraction form
    1,361.36/1,879.07 = 919.82/x
  3. Step 3: Cross multiply
    1,361.36x = 1,879.07 × 919.82
  4. Step 4: Simplify right side
    1,361.36x = 1,728,392.17
  5. Step 5: Solve for x
    x = 1,728,392.17/1,361.36
  6. Step 6: Final answer
    x = 1,269.61

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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.