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Finding the Fourth Proportional to 1,391.33, 1,919.21 and 867.26

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Solution

The fourth proportional to 1,391.33, 1,919.21 and 867.26 is: 1,196.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.33 : 1,919.21 = 867.26 : x
  2. Step 2: Convert to fraction form
    1,391.33/1,919.21 = 867.26/x
  3. Step 3: Cross multiply
    1,391.33x = 1,919.21 × 867.26
  4. Step 4: Simplify right side
    1,391.33x = 1,664,440.13
  5. Step 5: Solve for x
    x = 1,664,440.13/1,391.33
  6. Step 6: Final answer
    x = 1,196.30

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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.