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Finding the Fourth Proportional to 2,658.67, 3,986.78 and 809.37

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Solution

The fourth proportional to 2,658.67, 3,986.78 and 809.37 is: 1,213.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,658.67 : 3,986.78 = 809.37 : x
  2. Step 2: Convert to fraction form
    2,658.67/3,986.78 = 809.37/x
  3. Step 3: Cross multiply
    2,658.67x = 3,986.78 × 809.37
  4. Step 4: Simplify right side
    2,658.67x = 3,226,776.08
  5. Step 5: Solve for x
    x = 3,226,776.08/2,658.67
  6. Step 6: Final answer
    x = 1,213.68

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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.