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Finding the Fourth Proportional to 2,634.78, 3,951.62 and 991.28

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Solution

The fourth proportional to 2,634.78, 3,951.62 and 991.28 is: 1,486.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,634.78 : 3,951.62 = 991.28 : x
  2. Step 2: Convert to fraction form
    2,634.78/3,951.62 = 991.28/x
  3. Step 3: Cross multiply
    2,634.78x = 3,951.62 × 991.28
  4. Step 4: Simplify right side
    2,634.78x = 3,917,161.87
  5. Step 5: Solve for x
    x = 3,917,161.87/2,634.78
  6. Step 6: Final answer
    x = 1,486.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.