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Finding the Fourth Proportional to 309.79, 427.49 and 169.91

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Solution

The fourth proportional to 309.79, 427.49 and 169.91 is: 234.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.79 : 427.49 = 169.91 : x
  2. Step 2: Convert to fraction form
    309.79/427.49 = 169.91/x
  3. Step 3: Cross multiply
    309.79x = 427.49 × 169.91
  4. Step 4: Simplify right side
    309.79x = 72,637.44
  5. Step 5: Solve for x
    x = 72,637.44/309.79
  6. Step 6: Final answer
    x = 234.47

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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.