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Finding the Fourth Proportional to 2,660.04, 3,990.21 and 811.28

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Solution

The fourth proportional to 2,660.04, 3,990.21 and 811.28 is: 1,216.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.04 : 3,990.21 = 811.28 : x
  2. Step 2: Convert to fraction form
    2,660.04/3,990.21 = 811.28/x
  3. Step 3: Cross multiply
    2,660.04x = 3,990.21 × 811.28
  4. Step 4: Simplify right side
    2,660.04x = 3,237,189.07
  5. Step 5: Solve for x
    x = 3,237,189.07/2,660.04
  6. Step 6: Final answer
    x = 1,216.97

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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.