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Finding the Fourth Proportional to 391.44, 586.62 and 218.19

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Solution

The fourth proportional to 391.44, 586.62 and 218.19 is: 326.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.44 : 586.62 = 218.19 : x
  2. Step 2: Convert to fraction form
    391.44/586.62 = 218.19/x
  3. Step 3: Cross multiply
    391.44x = 586.62 × 218.19
  4. Step 4: Simplify right side
    391.44x = 127,994.62
  5. Step 5: Solve for x
    x = 127,994.62/391.44
  6. Step 6: Final answer
    x = 326.98

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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.