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Finding the Fourth Proportional to 189.75, 284.61 and 81.51

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Solution

The fourth proportional to 189.75, 284.61 and 81.51 is: 122.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.75 : 284.61 = 81.51 : x
  2. Step 2: Convert to fraction form
    189.75/284.61 = 81.51/x
  3. Step 3: Cross multiply
    189.75x = 284.61 × 81.51
  4. Step 4: Simplify right side
    189.75x = 23,198.56
  5. Step 5: Solve for x
    x = 23,198.56/189.75
  6. Step 6: Final answer
    x = 122.26

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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.