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Finding the Fourth Proportional to 2,661.40, 3,992.22 and 812.78

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Solution

The fourth proportional to 2,661.40, 3,992.22 and 812.78 is: 1,219.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.40 : 3,992.22 = 812.78 : x
  2. Step 2: Convert to fraction form
    2,661.40/3,992.22 = 812.78/x
  3. Step 3: Cross multiply
    2,661.40x = 3,992.22 × 812.78
  4. Step 4: Simplify right side
    2,661.40x = 3,244,796.57
  5. Step 5: Solve for x
    x = 3,244,796.57/2,661.40
  6. Step 6: Final answer
    x = 1,219.21

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1.5x scale

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.