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Finding the Fourth Proportional to 189.83, 284.82 and 81.62

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Solution

The fourth proportional to 189.83, 284.82 and 81.62 is: 122.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.83 : 284.82 = 81.62 : x
  2. Step 2: Convert to fraction form
    189.83/284.82 = 81.62/x
  3. Step 3: Cross multiply
    189.83x = 284.82 × 81.62
  4. Step 4: Simplify right side
    189.83x = 23,247.01
  5. Step 5: Solve for x
    x = 23,247.01/189.83
  6. Step 6: Final answer
    x = 122.46

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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.