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Finding the Fourth Proportional to 391.97, 588.53 and 218.98

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Solution

The fourth proportional to 391.97, 588.53 and 218.98 is: 328.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.97 : 588.53 = 218.98 : x
  2. Step 2: Convert to fraction form
    391.97/588.53 = 218.98/x
  3. Step 3: Cross multiply
    391.97x = 588.53 × 218.98
  4. Step 4: Simplify right side
    391.97x = 128,873.36
  5. Step 5: Solve for x
    x = 128,873.36/391.97
  6. Step 6: Final answer
    x = 328.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.