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Finding the Fourth Proportional to 310.09, 427.71 and 211.68

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Solution

The fourth proportional to 310.09, 427.71 and 211.68 is: 291.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.09 : 427.71 = 211.68 : x
  2. Step 2: Convert to fraction form
    310.09/427.71 = 211.68/x
  3. Step 3: Cross multiply
    310.09x = 427.71 × 211.68
  4. Step 4: Simplify right side
    310.09x = 90,537.65
  5. Step 5: Solve for x
    x = 90,537.65/310.09
  6. Step 6: Final answer
    x = 291.97

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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.