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Finding the Fourth Proportional to 309.05, 426.72 and 226.28

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Solution

The fourth proportional to 309.05, 426.72 and 226.28 is: 312.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.05 : 426.72 = 226.28 : x
  2. Step 2: Convert to fraction form
    309.05/426.72 = 226.28/x
  3. Step 3: Cross multiply
    309.05x = 426.72 × 226.28
  4. Step 4: Simplify right side
    309.05x = 96,556.07
  5. Step 5: Solve for x
    x = 96,556.07/309.05
  6. Step 6: Final answer
    x = 312.43

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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.