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Finding the Fourth Proportional to 217.38, 299.91 and 143.74

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Solution

The fourth proportional to 217.38, 299.91 and 143.74 is: 198.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.38 : 299.91 = 143.74 : x
  2. Step 2: Convert to fraction form
    217.38/299.91 = 143.74/x
  3. Step 3: Cross multiply
    217.38x = 299.91 × 143.74
  4. Step 4: Simplify right side
    217.38x = 43,109.06
  5. Step 5: Solve for x
    x = 43,109.06/217.38
  6. Step 6: Final answer
    x = 198.32

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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.