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Finding the Fourth Proportional to 1,391.48, 1,919.22 and 1,369.88

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Solution

The fourth proportional to 1,391.48, 1,919.22 and 1,369.88 is: 1,889.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.48 : 1,919.22 = 1,369.88 : x
  2. Step 2: Convert to fraction form
    1,391.48/1,919.22 = 1,369.88/x
  3. Step 3: Cross multiply
    1,391.48x = 1,919.22 × 1,369.88
  4. Step 4: Simplify right side
    1,391.48x = 2,629,101.09
  5. Step 5: Solve for x
    x = 2,629,101.09/1,391.48
  6. Step 6: Final answer
    x = 1,889.43

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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.