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Finding the Fourth Proportional to 109.28, 150.88 and 67.92

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Solution

The fourth proportional to 109.28, 150.88 and 67.92 is: 93.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.28 : 150.88 = 67.92 : x
  2. Step 2: Convert to fraction form
    109.28/150.88 = 67.92/x
  3. Step 3: Cross multiply
    109.28x = 150.88 × 67.92
  4. Step 4: Simplify right side
    109.28x = 10,247.77
  5. Step 5: Solve for x
    x = 10,247.77/109.28
  6. Step 6: Final answer
    x = 93.78

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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.