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Finding the Fourth Proportional to 120.96, 180.90 and 107.28

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Solution

The fourth proportional to 120.96, 180.90 and 107.28 is: 160.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.96 : 180.90 = 107.28 : x
  2. Step 2: Convert to fraction form
    120.96/180.90 = 107.28/x
  3. Step 3: Cross multiply
    120.96x = 180.90 × 107.28
  4. Step 4: Simplify right side
    120.96x = 19,406.95
  5. Step 5: Solve for x
    x = 19,406.95/120.96
  6. Step 6: Final answer
    x = 160.44

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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.