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Finding the Fourth Proportional to 326.68, 488.94 and 217.72

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Solution

The fourth proportional to 326.68, 488.94 and 217.72 is: 325.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.68 : 488.94 = 217.72 : x
  2. Step 2: Convert to fraction form
    326.68/488.94 = 217.72/x
  3. Step 3: Cross multiply
    326.68x = 488.94 × 217.72
  4. Step 4: Simplify right side
    326.68x = 106,452.02
  5. Step 5: Solve for x
    x = 106,452.02/326.68
  6. Step 6: Final answer
    x = 325.86

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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.