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Finding the Fourth Proportional to 309.42, 426.94 and 185.09

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Solution

The fourth proportional to 309.42, 426.94 and 185.09 is: 255.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.42 : 426.94 = 185.09 : x
  2. Step 2: Convert to fraction form
    309.42/426.94 = 185.09/x
  3. Step 3: Cross multiply
    309.42x = 426.94 × 185.09
  4. Step 4: Simplify right side
    309.42x = 79,019.73
  5. Step 5: Solve for x
    x = 79,019.73/309.42
  6. Step 6: Final answer
    x = 255.38

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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.