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Finding the Fourth Proportional to 217.71, 326.57 and 87.77

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Solution

The fourth proportional to 217.71, 326.57 and 87.77 is: 131.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.71 : 326.57 = 87.77 : x
  2. Step 2: Convert to fraction form
    217.71/326.57 = 87.77/x
  3. Step 3: Cross multiply
    217.71x = 326.57 × 87.77
  4. Step 4: Simplify right side
    217.71x = 28,660.98
  5. Step 5: Solve for x
    x = 28,660.98/217.71
  6. Step 6: Final answer
    x = 131.65

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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.