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Finding the Fourth Proportional to 217.90, 326.61 and 87.82

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Solution

The fourth proportional to 217.90, 326.61 and 87.82 is: 131.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.90 : 326.61 = 87.82 : x
  2. Step 2: Convert to fraction form
    217.90/326.61 = 87.82/x
  3. Step 3: Cross multiply
    217.90x = 326.61 × 87.82
  4. Step 4: Simplify right side
    217.90x = 28,682.89
  5. Step 5: Solve for x
    x = 28,682.89/217.90
  6. Step 6: Final answer
    x = 131.63

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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.