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Finding the Fourth Proportional to 391.44, 587.37 and 172.22

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Solution

The fourth proportional to 391.44, 587.37 and 172.22 is: 258.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.44 : 587.37 = 172.22 : x
  2. Step 2: Convert to fraction form
    391.44/587.37 = 172.22/x
  3. Step 3: Cross multiply
    391.44x = 587.37 × 172.22
  4. Step 4: Simplify right side
    391.44x = 101,158.85
  5. Step 5: Solve for x
    x = 101,158.85/391.44
  6. Step 6: Final answer
    x = 258.42

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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.