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Finding the Fourth Proportional to 144.12, 198.65 and 120.88

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Solution

The fourth proportional to 144.12, 198.65 and 120.88 is: 166.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.12 : 198.65 = 120.88 : x
  2. Step 2: Convert to fraction form
    144.12/198.65 = 120.88/x
  3. Step 3: Cross multiply
    144.12x = 198.65 × 120.88
  4. Step 4: Simplify right side
    144.12x = 24,012.81
  5. Step 5: Solve for x
    x = 24,012.81/144.12
  6. Step 6: Final answer
    x = 166.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.