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Finding the Fourth Proportional to 309.31, 426.81 and 169.40

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Solution

The fourth proportional to 309.31, 426.81 and 169.40 is: 233.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.31 : 426.81 = 169.40 : x
  2. Step 2: Convert to fraction form
    309.31/426.81 = 169.40/x
  3. Step 3: Cross multiply
    309.31x = 426.81 × 169.40
  4. Step 4: Simplify right side
    309.31x = 72,301.61
  5. Step 5: Solve for x
    x = 72,301.61/309.31
  6. Step 6: Final answer
    x = 233.75

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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.