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Finding the Fourth Proportional to 189.79, 284.43 and 79.97

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Solution

The fourth proportional to 189.79, 284.43 and 79.97 is: 119.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.79 : 284.43 = 79.97 : x
  2. Step 2: Convert to fraction form
    189.79/284.43 = 79.97/x
  3. Step 3: Cross multiply
    189.79x = 284.43 × 79.97
  4. Step 4: Simplify right side
    189.79x = 22,745.87
  5. Step 5: Solve for x
    x = 22,745.87/189.79
  6. Step 6: Final answer
    x = 119.85

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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.