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Finding the Fourth Proportional to 309.49, 427.09 and 169.61

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Solution

The fourth proportional to 309.49, 427.09 and 169.61 is: 234.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.49 : 427.09 = 169.61 : x
  2. Step 2: Convert to fraction form
    309.49/427.09 = 169.61/x
  3. Step 3: Cross multiply
    309.49x = 427.09 × 169.61
  4. Step 4: Simplify right side
    309.49x = 72,436.07
  5. Step 5: Solve for x
    x = 72,436.07/309.49
  6. Step 6: Final answer
    x = 234.05

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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.