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Finding the Fourth Proportional to 109.38, 150.84 and 91.92

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Solution

The fourth proportional to 109.38, 150.84 and 91.92 is: 126.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.38 : 150.84 = 91.92 : x
  2. Step 2: Convert to fraction form
    109.38/150.84 = 91.92/x
  3. Step 3: Cross multiply
    109.38x = 150.84 × 91.92
  4. Step 4: Simplify right side
    109.38x = 13,865.21
  5. Step 5: Solve for x
    x = 13,865.21/109.38
  6. Step 6: Final answer
    x = 126.76

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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.