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Finding the Fourth Proportional to 217.44, 326.13 and 87.36

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Solution

The fourth proportional to 217.44, 326.13 and 87.36 is: 131.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.44 : 326.13 = 87.36 : x
  2. Step 2: Convert to fraction form
    217.44/326.13 = 87.36/x
  3. Step 3: Cross multiply
    217.44x = 326.13 × 87.36
  4. Step 4: Simplify right side
    217.44x = 28,490.72
  5. Step 5: Solve for x
    x = 28,490.72/217.44
  6. Step 6: Final answer
    x = 131.03

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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.