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Finding the Fourth Proportional to 1,388.09, 1,910.48 and 1,107.43

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Solution

The fourth proportional to 1,388.09, 1,910.48 and 1,107.43 is: 1,524.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.09 : 1,910.48 = 1,107.43 : x
  2. Step 2: Convert to fraction form
    1,388.09/1,910.48 = 1,107.43/x
  3. Step 3: Cross multiply
    1,388.09x = 1,910.48 × 1,107.43
  4. Step 4: Simplify right side
    1,388.09x = 2,115,722.87
  5. Step 5: Solve for x
    x = 2,115,722.87/1,388.09
  6. Step 6: Final answer
    x = 1,524.20

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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.