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Finding the Fourth Proportional to 2,661.26, 3,991.64 and 812.81

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Solution

The fourth proportional to 2,661.26, 3,991.64 and 812.81 is: 1,219.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.26 : 3,991.64 = 812.81 : x
  2. Step 2: Convert to fraction form
    2,661.26/3,991.64 = 812.81/x
  3. Step 3: Cross multiply
    2,661.26x = 3,991.64 × 812.81
  4. Step 4: Simplify right side
    2,661.26x = 3,244,420.89
  5. Step 5: Solve for x
    x = 3,244,420.89/2,661.26
  6. Step 6: Final answer
    x = 1,219.13

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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.