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Finding the Fourth Proportional to 109.20, 163.44 and 77.04

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Solution

The fourth proportional to 109.20, 163.44 and 77.04 is: 115.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.20 : 163.44 = 77.04 : x
  2. Step 2: Convert to fraction form
    109.20/163.44 = 77.04/x
  3. Step 3: Cross multiply
    109.20x = 163.44 × 77.04
  4. Step 4: Simplify right side
    109.20x = 12,591.42
  5. Step 5: Solve for x
    x = 12,591.42/109.20
  6. Step 6: Final answer
    x = 115.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.