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Finding the Fourth Proportional to 289.39, 399.38 and 165.09

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Solution

The fourth proportional to 289.39, 399.38 and 165.09 is: 227.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.39 : 399.38 = 165.09 : x
  2. Step 2: Convert to fraction form
    289.39/399.38 = 165.09/x
  3. Step 3: Cross multiply
    289.39x = 399.38 × 165.09
  4. Step 4: Simplify right side
    289.39x = 65,933.00
  5. Step 5: Solve for x
    x = 65,933.00/289.39
  6. Step 6: Final answer
    x = 227.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.