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Finding the Fourth Proportional to 2,759.06, 4,138.60 and 812.64

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Solution

The fourth proportional to 2,759.06, 4,138.60 and 812.64 is: 1,218.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,759.06 : 4,138.60 = 812.64 : x
  2. Step 2: Convert to fraction form
    2,759.06/4,138.60 = 812.64/x
  3. Step 3: Cross multiply
    2,759.06x = 4,138.60 × 812.64
  4. Step 4: Simplify right side
    2,759.06x = 3,363,191.90
  5. Step 5: Solve for x
    x = 3,363,191.90/2,759.06
  6. Step 6: Final answer
    x = 1,218.96

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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.