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Finding the Fourth Proportional to 309.75, 427.44 and 169.87

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Solution

The fourth proportional to 309.75, 427.44 and 169.87 is: 234.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.75 : 427.44 = 169.87 : x
  2. Step 2: Convert to fraction form
    309.75/427.44 = 169.87/x
  3. Step 3: Cross multiply
    309.75x = 427.44 × 169.87
  4. Step 4: Simplify right side
    309.75x = 72,609.23
  5. Step 5: Solve for x
    x = 72,609.23/309.75
  6. Step 6: Final answer
    x = 234.41

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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.