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Finding the Fourth Proportional to 217.49, 300.24 and 143.78

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Solution

The fourth proportional to 217.49, 300.24 and 143.78 is: 198.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.49 : 300.24 = 143.78 : x
  2. Step 2: Convert to fraction form
    217.49/300.24 = 143.78/x
  3. Step 3: Cross multiply
    217.49x = 300.24 × 143.78
  4. Step 4: Simplify right side
    217.49x = 43,167.01
  5. Step 5: Solve for x
    x = 43,167.01/217.49
  6. Step 6: Final answer
    x = 198.48

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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.