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Finding the Fourth Proportional to 391.26, 586.51 and 218.01

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Solution

The fourth proportional to 391.26, 586.51 and 218.01 is: 326.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.26 : 586.51 = 218.01 : x
  2. Step 2: Convert to fraction form
    391.26/586.51 = 218.01/x
  3. Step 3: Cross multiply
    391.26x = 586.51 × 218.01
  4. Step 4: Simplify right side
    391.26x = 127,863.40
  5. Step 5: Solve for x
    x = 127,863.40/391.26
  6. Step 6: Final answer
    x = 326.80

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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.