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Finding the Fourth Proportional to 217.89, 325.22 and 186.91

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Solution

The fourth proportional to 217.89, 325.22 and 186.91 is: 278.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.89 : 325.22 = 186.91 : x
  2. Step 2: Convert to fraction form
    217.89/325.22 = 186.91/x
  3. Step 3: Cross multiply
    217.89x = 325.22 × 186.91
  4. Step 4: Simplify right side
    217.89x = 60,785.12
  5. Step 5: Solve for x
    x = 60,785.12/217.89
  6. Step 6: Final answer
    x = 278.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.