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Finding the Fourth Proportional to 892.34, 1,338.97 and 399.09

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Solution

The fourth proportional to 892.34, 1,338.97 and 399.09 is: 598.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.34 : 1,338.97 = 399.09 : x
  2. Step 2: Convert to fraction form
    892.34/1,338.97 = 399.09/x
  3. Step 3: Cross multiply
    892.34x = 1,338.97 × 399.09
  4. Step 4: Simplify right side
    892.34x = 534,369.54
  5. Step 5: Solve for x
    x = 534,369.54/892.34
  6. Step 6: Final answer
    x = 598.84

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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.