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Finding the Fourth Proportional to 120.12, 180.33 and 66.05

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Solution

The fourth proportional to 120.12, 180.33 and 66.05 is: 99.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.12 : 180.33 = 66.05 : x
  2. Step 2: Convert to fraction form
    120.12/180.33 = 66.05/x
  3. Step 3: Cross multiply
    120.12x = 180.33 × 66.05
  4. Step 4: Simplify right side
    120.12x = 11,910.80
  5. Step 5: Solve for x
    x = 11,910.80/120.12
  6. Step 6: Final answer
    x = 99.16

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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.