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Finding the Fourth Proportional to 309.83, 427.28 and 211.41

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Solution

The fourth proportional to 309.83, 427.28 and 211.41 is: 291.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.83 : 427.28 = 211.41 : x
  2. Step 2: Convert to fraction form
    309.83/427.28 = 211.41/x
  3. Step 3: Cross multiply
    309.83x = 427.28 × 211.41
  4. Step 4: Simplify right side
    309.83x = 90,330.21
  5. Step 5: Solve for x
    x = 90,330.21/309.83
  6. Step 6: Final answer
    x = 291.55

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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.