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Finding the Fourth Proportional to 2,660.94, 3,990.08 and 811.62

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Solution

The fourth proportional to 2,660.94, 3,990.08 and 811.62 is: 1,217.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.94 : 3,990.08 = 811.62 : x
  2. Step 2: Convert to fraction form
    2,660.94/3,990.08 = 811.62/x
  3. Step 3: Cross multiply
    2,660.94x = 3,990.08 × 811.62
  4. Step 4: Simplify right side
    2,660.94x = 3,238,430.76
  5. Step 5: Solve for x
    x = 3,238,430.76/2,660.94
  6. Step 6: Final answer
    x = 1,217.03

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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.