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Finding the Fourth Proportional to 2,719.20, 4,078.96 and 771.25

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Solution

The fourth proportional to 2,719.20, 4,078.96 and 771.25 is: 1,156.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,719.20 : 4,078.96 = 771.25 : x
  2. Step 2: Convert to fraction form
    2,719.20/4,078.96 = 771.25/x
  3. Step 3: Cross multiply
    2,719.20x = 4,078.96 × 771.25
  4. Step 4: Simplify right side
    2,719.20x = 3,145,894.04
  5. Step 5: Solve for x
    x = 3,145,894.04/2,719.20
  6. Step 6: Final answer
    x = 1,156.92

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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.