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Finding the Fourth Proportional to 189.20, 283.26 and 120.80

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Solution

The fourth proportional to 189.20, 283.26 and 120.80 is: 180.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.20 : 283.26 = 120.80 : x
  2. Step 2: Convert to fraction form
    189.20/283.26 = 120.80/x
  3. Step 3: Cross multiply
    189.20x = 283.26 × 120.80
  4. Step 4: Simplify right side
    189.20x = 34,217.81
  5. Step 5: Solve for x
    x = 34,217.81/189.20
  6. Step 6: Final answer
    x = 180.86

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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.