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Finding the Fourth Proportional to 189.28, 283.68 and 81.04

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Solution

The fourth proportional to 189.28, 283.68 and 81.04 is: 121.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.28 : 283.68 = 81.04 : x
  2. Step 2: Convert to fraction form
    189.28/283.68 = 81.04/x
  3. Step 3: Cross multiply
    189.28x = 283.68 × 81.04
  4. Step 4: Simplify right side
    189.28x = 22,989.43
  5. Step 5: Solve for x
    x = 22,989.43/189.28
  6. Step 6: Final answer
    x = 121.46

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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.