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Finding the Fourth Proportional to 217.25, 325.99 and 87.31

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Solution

The fourth proportional to 217.25, 325.99 and 87.31 is: 131.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.25 : 325.99 = 87.31 : x
  2. Step 2: Convert to fraction form
    217.25/325.99 = 87.31/x
  3. Step 3: Cross multiply
    217.25x = 325.99 × 87.31
  4. Step 4: Simplify right side
    217.25x = 28,462.70
  5. Step 5: Solve for x
    x = 28,462.70/217.25
  6. Step 6: Final answer
    x = 131.01

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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.