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Finding the Fourth Proportional to 395.22, 544.71 and 321.72

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Solution

The fourth proportional to 395.22, 544.71 and 321.72 is: 443.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.22 : 544.71 = 321.72 : x
  2. Step 2: Convert to fraction form
    395.22/544.71 = 321.72/x
  3. Step 3: Cross multiply
    395.22x = 544.71 × 321.72
  4. Step 4: Simplify right side
    395.22x = 175,244.10
  5. Step 5: Solve for x
    x = 175,244.10/395.22
  6. Step 6: Final answer
    x = 443.41

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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.