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Finding the Fourth Proportional to 134.38, 185.37 and 81.91

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Solution

The fourth proportional to 134.38, 185.37 and 81.91 is: 112.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.38 : 185.37 = 81.91 : x
  2. Step 2: Convert to fraction form
    134.38/185.37 = 81.91/x
  3. Step 3: Cross multiply
    134.38x = 185.37 × 81.91
  4. Step 4: Simplify right side
    134.38x = 15,183.19
  5. Step 5: Solve for x
    x = 15,183.19/134.38
  6. Step 6: Final answer
    x = 112.99

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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.