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Finding the Fourth Proportional to 2,719.17, 4,078.74 and 771.37

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Solution

The fourth proportional to 2,719.17, 4,078.74 and 771.37 is: 1,157.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,719.17 : 4,078.74 = 771.37 : x
  2. Step 2: Convert to fraction form
    2,719.17/4,078.74 = 771.37/x
  3. Step 3: Cross multiply
    2,719.17x = 4,078.74 × 771.37
  4. Step 4: Simplify right side
    2,719.17x = 3,146,217.67
  5. Step 5: Solve for x
    x = 3,146,217.67/2,719.17
  6. Step 6: Final answer
    x = 1,157.05

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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.