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Finding the Fourth Proportional to 291.89, 402.09 and 226.28

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Solution

The fourth proportional to 291.89, 402.09 and 226.28 is: 311.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.89 : 402.09 = 226.28 : x
  2. Step 2: Convert to fraction form
    291.89/402.09 = 226.28/x
  3. Step 3: Cross multiply
    291.89x = 402.09 × 226.28
  4. Step 4: Simplify right side
    291.89x = 90,984.93
  5. Step 5: Solve for x
    x = 90,984.93/291.89
  6. Step 6: Final answer
    x = 311.71

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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.