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Finding the Fourth Proportional to 217.46, 326.61 and 172.15

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Solution

The fourth proportional to 217.46, 326.61 and 172.15 is: 258.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.46 : 326.61 = 172.15 : x
  2. Step 2: Convert to fraction form
    217.46/326.61 = 172.15/x
  3. Step 3: Cross multiply
    217.46x = 326.61 × 172.15
  4. Step 4: Simplify right side
    217.46x = 56,225.09
  5. Step 5: Solve for x
    x = 56,225.09/217.46
  6. Step 6: Final answer
    x = 258.55

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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.