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Finding the Fourth Proportional to 391.69, 539.62 and 326.08

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Solution

The fourth proportional to 391.69, 539.62 and 326.08 is: 449.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.69 : 539.62 = 326.08 : x
  2. Step 2: Convert to fraction form
    391.69/539.62 = 326.08/x
  3. Step 3: Cross multiply
    391.69x = 539.62 × 326.08
  4. Step 4: Simplify right side
    391.69x = 175,959.29
  5. Step 5: Solve for x
    x = 175,959.29/391.69
  6. Step 6: Final answer
    x = 449.23

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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.