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Finding the Fourth Proportional to 2,719.07, 4,078.86 and 771.22

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Solution

The fourth proportional to 2,719.07, 4,078.86 and 771.22 is: 1,156.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,719.07 : 4,078.86 = 771.22 : x
  2. Step 2: Convert to fraction form
    2,719.07/4,078.86 = 771.22/x
  3. Step 3: Cross multiply
    2,719.07x = 4,078.86 × 771.22
  4. Step 4: Simplify right side
    2,719.07x = 3,145,700.62
  5. Step 5: Solve for x
    x = 3,145,700.62/2,719.07
  6. Step 6: Final answer
    x = 1,156.90

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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.