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Finding the Fourth Proportional to 217.28, 299.76 and 143.58

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Solution

The fourth proportional to 217.28, 299.76 and 143.58 is: 198.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.28 : 299.76 = 143.58 : x
  2. Step 2: Convert to fraction form
    217.28/299.76 = 143.58/x
  3. Step 3: Cross multiply
    217.28x = 299.76 × 143.58
  4. Step 4: Simplify right side
    217.28x = 43,039.54
  5. Step 5: Solve for x
    x = 43,039.54/217.28
  6. Step 6: Final answer
    x = 198.08

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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.