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Finding the Fourth Proportional to 438.12, 605.39 and 326.54

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Solution

The fourth proportional to 438.12, 605.39 and 326.54 is: 451.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.12 : 605.39 = 326.54 : x
  2. Step 2: Convert to fraction form
    438.12/605.39 = 326.54/x
  3. Step 3: Cross multiply
    438.12x = 605.39 × 326.54
  4. Step 4: Simplify right side
    438.12x = 197,684.05
  5. Step 5: Solve for x
    x = 197,684.05/438.12
  6. Step 6: Final answer
    x = 451.21

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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.