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Finding the Fourth Proportional to 309.09, 426.54 and 169.20

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Solution

The fourth proportional to 309.09, 426.54 and 169.20 is: 233.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.09 : 426.54 = 169.20 : x
  2. Step 2: Convert to fraction form
    309.09/426.54 = 169.20/x
  3. Step 3: Cross multiply
    309.09x = 426.54 × 169.20
  4. Step 4: Simplify right side
    309.09x = 72,168.44
  5. Step 5: Solve for x
    x = 72,168.44/309.09
  6. Step 6: Final answer
    x = 233.48

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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.