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Finding the Fourth Proportional to 217.22, 325.98 and 85.46

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Solution

The fourth proportional to 217.22, 325.98 and 85.46 is: 128.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.22 : 325.98 = 85.46 : x
  2. Step 2: Convert to fraction form
    217.22/325.98 = 85.46/x
  3. Step 3: Cross multiply
    217.22x = 325.98 × 85.46
  4. Step 4: Simplify right side
    217.22x = 27,857.82
  5. Step 5: Solve for x
    x = 27,857.82/217.22
  6. Step 6: Final answer
    x = 128.25

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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.