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Finding the Fourth Proportional to 217.71, 300.41 and 138.99

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Solution

The fourth proportional to 217.71, 300.41 and 138.99 is: 191.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.71 : 300.41 = 138.99 : x
  2. Step 2: Convert to fraction form
    217.71/300.41 = 138.99/x
  3. Step 3: Cross multiply
    217.71x = 300.41 × 138.99
  4. Step 4: Simplify right side
    217.71x = 41,755.72
  5. Step 5: Solve for x
    x = 41,755.72/217.71
  6. Step 6: Final answer
    x = 191.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.