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Finding the Fourth Proportional to 217.81, 326.99 and 172.72

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Solution

The fourth proportional to 217.81, 326.99 and 172.72 is: 259.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.81 : 326.99 = 172.72 : x
  2. Step 2: Convert to fraction form
    217.81/326.99 = 172.72/x
  3. Step 3: Cross multiply
    217.81x = 326.99 × 172.72
  4. Step 4: Simplify right side
    217.81x = 56,477.71
  5. Step 5: Solve for x
    x = 56,477.71/217.81
  6. Step 6: Final answer
    x = 259.30

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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.