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Finding the Fourth Proportional to 391.19, 539.86 and 233.79

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Solution

The fourth proportional to 391.19, 539.86 and 233.79 is: 322.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.19 : 539.86 = 233.79 : x
  2. Step 2: Convert to fraction form
    391.19/539.86 = 233.79/x
  3. Step 3: Cross multiply
    391.19x = 539.86 × 233.79
  4. Step 4: Simplify right side
    391.19x = 126,213.87
  5. Step 5: Solve for x
    x = 126,213.87/391.19
  6. Step 6: Final answer
    x = 322.64

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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.