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Finding the Fourth Proportional to 2,661.20, 3,991.72 and 812.24

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Solution

The fourth proportional to 2,661.20, 3,991.72 and 812.24 is: 1,218.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.20 : 3,991.72 = 812.24 : x
  2. Step 2: Convert to fraction form
    2,661.20/3,991.72 = 812.24/x
  3. Step 3: Cross multiply
    2,661.20x = 3,991.72 × 812.24
  4. Step 4: Simplify right side
    2,661.20x = 3,242,234.65
  5. Step 5: Solve for x
    x = 3,242,234.65/2,661.20
  6. Step 6: Final answer
    x = 1,218.34

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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.