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Finding the Fourth Proportional to 2,660.82, 3,990.03 and 812.16

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Solution

The fourth proportional to 2,660.82, 3,990.03 and 812.16 is: 1,217.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.82 : 3,990.03 = 812.16 : x
  2. Step 2: Convert to fraction form
    2,660.82/3,990.03 = 812.16/x
  3. Step 3: Cross multiply
    2,660.82x = 3,990.03 × 812.16
  4. Step 4: Simplify right side
    2,660.82x = 3,240,542.76
  5. Step 5: Solve for x
    x = 3,240,542.76/2,660.82
  6. Step 6: Final answer
    x = 1,217.87

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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.