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Finding the Fourth Proportional to 293.89, 405.39 and 211.09

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Solution

The fourth proportional to 293.89, 405.39 and 211.09 is: 291.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    293.89 : 405.39 = 211.09 : x
  2. Step 2: Convert to fraction form
    293.89/405.39 = 211.09/x
  3. Step 3: Cross multiply
    293.89x = 405.39 × 211.09
  4. Step 4: Simplify right side
    293.89x = 85,573.78
  5. Step 5: Solve for x
    x = 85,573.78/293.89
  6. Step 6: Final answer
    x = 291.18

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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.