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Finding the Fourth Proportional to 199.28, 274.92 and 143.88

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Solution

The fourth proportional to 199.28, 274.92 and 143.88 is: 198.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.28 : 274.92 = 143.88 : x
  2. Step 2: Convert to fraction form
    199.28/274.92 = 143.88/x
  3. Step 3: Cross multiply
    199.28x = 274.92 × 143.88
  4. Step 4: Simplify right side
    199.28x = 39,555.49
  5. Step 5: Solve for x
    x = 39,555.49/199.28
  6. Step 6: Final answer
    x = 198.49

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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.