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Finding the Fourth Proportional to 1,361.82, 1,879.19 and 920.32

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Solution

The fourth proportional to 1,361.82, 1,879.19 and 920.32 is: 1,269.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.82 : 1,879.19 = 920.32 : x
  2. Step 2: Convert to fraction form
    1,361.82/1,879.19 = 920.32/x
  3. Step 3: Cross multiply
    1,361.82x = 1,879.19 × 920.32
  4. Step 4: Simplify right side
    1,361.82x = 1,729,442.14
  5. Step 5: Solve for x
    x = 1,729,442.14/1,361.82
  6. Step 6: Final answer
    x = 1,269.95

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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.