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Finding the Fourth Proportional to 120.84, 180.98 and 107.86

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Solution

The fourth proportional to 120.84, 180.98 and 107.86 is: 161.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.84 : 180.98 = 107.86 : x
  2. Step 2: Convert to fraction form
    120.84/180.98 = 107.86/x
  3. Step 3: Cross multiply
    120.84x = 180.98 × 107.86
  4. Step 4: Simplify right side
    120.84x = 19,520.50
  5. Step 5: Solve for x
    x = 19,520.50/120.84
  6. Step 6: Final answer
    x = 161.54

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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.