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Finding the Fourth Proportional to 217.81, 326.51 and 87.74

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Solution

The fourth proportional to 217.81, 326.51 and 87.74 is: 131.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.81 : 326.51 = 87.74 : x
  2. Step 2: Convert to fraction form
    217.81/326.51 = 87.74/x
  3. Step 3: Cross multiply
    217.81x = 326.51 × 87.74
  4. Step 4: Simplify right side
    217.81x = 28,647.99
  5. Step 5: Solve for x
    x = 28,647.99/217.81
  6. Step 6: Final answer
    x = 131.53

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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.