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Finding the Fourth Proportional to 120.20, 180.02 and 89.68

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Solution

The fourth proportional to 120.20, 180.02 and 89.68 is: 134.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.20 : 180.02 = 89.68 : x
  2. Step 2: Convert to fraction form
    120.20/180.02 = 89.68/x
  3. Step 3: Cross multiply
    120.20x = 180.02 × 89.68
  4. Step 4: Simplify right side
    120.20x = 16,144.19
  5. Step 5: Solve for x
    x = 16,144.19/120.20
  6. Step 6: Final answer
    x = 134.31

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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.