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Finding the Fourth Proportional to 309.36, 427.19 and 211.35

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Solution

The fourth proportional to 309.36, 427.19 and 211.35 is: 291.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.36 : 427.19 = 211.35 : x
  2. Step 2: Convert to fraction form
    309.36/427.19 = 211.35/x
  3. Step 3: Cross multiply
    309.36x = 427.19 × 211.35
  4. Step 4: Simplify right side
    309.36x = 90,286.61
  5. Step 5: Solve for x
    x = 90,286.61/309.36
  6. Step 6: Final answer
    x = 291.85

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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.