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Finding the Fourth Proportional to 189.12, 283.74 and 80.94

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Solution

The fourth proportional to 189.12, 283.74 and 80.94 is: 121.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.12 : 283.74 = 80.94 : x
  2. Step 2: Convert to fraction form
    189.12/283.74 = 80.94/x
  3. Step 3: Cross multiply
    189.12x = 283.74 × 80.94
  4. Step 4: Simplify right side
    189.12x = 22,965.92
  5. Step 5: Solve for x
    x = 22,965.92/189.12
  6. Step 6: Final answer
    x = 121.44

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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.