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Finding the Fourth Proportional to 217.75, 300.39 and 130.39

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Solution

The fourth proportional to 217.75, 300.39 and 130.39 is: 179.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.75 : 300.39 = 130.39 : x
  2. Step 2: Convert to fraction form
    217.75/300.39 = 130.39/x
  3. Step 3: Cross multiply
    217.75x = 300.39 × 130.39
  4. Step 4: Simplify right side
    217.75x = 39,167.85
  5. Step 5: Solve for x
    x = 39,167.85/217.75
  6. Step 6: Final answer
    x = 179.88

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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.