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Finding the Fourth Proportional to 217.82, 327.18 and 172.10

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Solution

The fourth proportional to 217.82, 327.18 and 172.10 is: 258.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.82 : 327.18 = 172.10 : x
  2. Step 2: Convert to fraction form
    217.82/327.18 = 172.10/x
  3. Step 3: Cross multiply
    217.82x = 327.18 × 172.10
  4. Step 4: Simplify right side
    217.82x = 56,307.68
  5. Step 5: Solve for x
    x = 56,307.68/217.82
  6. Step 6: Final answer
    x = 258.51

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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.