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Finding the Fourth Proportional to 2,661.32, 3,990.78 and 812.66

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Solution

The fourth proportional to 2,661.32, 3,990.78 and 812.66 is: 1,218.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.32 : 3,990.78 = 812.66 : x
  2. Step 2: Convert to fraction form
    2,661.32/3,990.78 = 812.66/x
  3. Step 3: Cross multiply
    2,661.32x = 3,990.78 × 812.66
  4. Step 4: Simplify right side
    2,661.32x = 3,243,147.27
  5. Step 5: Solve for x
    x = 3,243,147.27/2,661.32
  6. Step 6: Final answer
    x = 1,218.62

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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.