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Finding the Fourth Proportional to 2,658.32, 3,986.46 and 809

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Solution

The fourth proportional to 2,658.32, 3,986.46 and 809 is: 1,213.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,658.32 : 3,986.46 = 809 : x
  2. Step 2: Convert to fraction form
    2,658.32/3,986.46 = 809/x
  3. Step 3: Cross multiply
    2,658.32x = 3,986.46 × 809
  4. Step 4: Simplify right side
    2,658.32x = 3,225,046.14
  5. Step 5: Solve for x
    x = 3,225,046.14/2,658.32
  6. Step 6: Final answer
    x = 1,213.19

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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.