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Finding the Fourth Proportional to 309.98, 427.42 and 211.56

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Solution

The fourth proportional to 309.98, 427.42 and 211.56 is: 291.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.98 : 427.42 = 211.56 : x
  2. Step 2: Convert to fraction form
    309.98/427.42 = 211.56/x
  3. Step 3: Cross multiply
    309.98x = 427.42 × 211.56
  4. Step 4: Simplify right side
    309.98x = 90,424.98
  5. Step 5: Solve for x
    x = 90,424.98/309.98
  6. Step 6: Final answer
    x = 291.71

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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.