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Finding the Fourth Proportional to 2,711.86, 4,067.78 and 763.81

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Solution

The fourth proportional to 2,711.86, 4,067.78 and 763.81 is: 1,145.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,711.86 : 4,067.78 = 763.81 : x
  2. Step 2: Convert to fraction form
    2,711.86/4,067.78 = 763.81/x
  3. Step 3: Cross multiply
    2,711.86x = 4,067.78 × 763.81
  4. Step 4: Simplify right side
    2,711.86x = 3,106,992.61
  5. Step 5: Solve for x
    x = 3,106,992.61/2,711.86
  6. Step 6: Final answer
    x = 1,145.71

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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.