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Finding the Fourth Proportional to 2,720.85, 4,081.88 and 773.07

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Solution

The fourth proportional to 2,720.85, 4,081.88 and 773.07 is: 1,159.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.85 : 4,081.88 = 773.07 : x
  2. Step 2: Convert to fraction form
    2,720.85/4,081.88 = 773.07/x
  3. Step 3: Cross multiply
    2,720.85x = 4,081.88 × 773.07
  4. Step 4: Simplify right side
    2,720.85x = 3,155,578.97
  5. Step 5: Solve for x
    x = 3,155,578.97/2,720.85
  6. Step 6: Final answer
    x = 1,159.78

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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.