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Finding the Fourth Proportional to 309.84, 427.44 and 211.56

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Solution

The fourth proportional to 309.84, 427.44 and 211.56 is: 291.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.84 : 427.44 = 211.56 : x
  2. Step 2: Convert to fraction form
    309.84/427.44 = 211.56/x
  3. Step 3: Cross multiply
    309.84x = 427.44 × 211.56
  4. Step 4: Simplify right side
    309.84x = 90,429.21
  5. Step 5: Solve for x
    x = 90,429.21/309.84
  6. Step 6: Final answer
    x = 291.86

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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.