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Finding the Fourth Proportional to 217.74, 326.27 and 87.61

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Solution

The fourth proportional to 217.74, 326.27 and 87.61 is: 131.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.74 : 326.27 = 87.61 : x
  2. Step 2: Convert to fraction form
    217.74/326.27 = 87.61/x
  3. Step 3: Cross multiply
    217.74x = 326.27 × 87.61
  4. Step 4: Simplify right side
    217.74x = 28,584.51
  5. Step 5: Solve for x
    x = 28,584.51/217.74
  6. Step 6: Final answer
    x = 131.28

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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.