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Finding the Fourth Proportional to 391.04, 584.32 and 326.40

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Solution

The fourth proportional to 391.04, 584.32 and 326.40 is: 487.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.04 : 584.32 = 326.40 : x
  2. Step 2: Convert to fraction form
    391.04/584.32 = 326.40/x
  3. Step 3: Cross multiply
    391.04x = 584.32 × 326.40
  4. Step 4: Simplify right side
    391.04x = 190,722.05
  5. Step 5: Solve for x
    x = 190,722.05/391.04
  6. Step 6: Final answer
    x = 487.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.