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Finding the Fourth Proportional to 217.68, 326.46 and 87.66

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Solution

The fourth proportional to 217.68, 326.46 and 87.66 is: 131.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.68 : 326.46 = 87.66 : x
  2. Step 2: Convert to fraction form
    217.68/326.46 = 87.66/x
  3. Step 3: Cross multiply
    217.68x = 326.46 × 87.66
  4. Step 4: Simplify right side
    217.68x = 28,617.48
  5. Step 5: Solve for x
    x = 28,617.48/217.68
  6. Step 6: Final answer
    x = 131.47

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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.