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Finding the Fourth Proportional to 189.86, 284.80 and 81.62

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Solution

The fourth proportional to 189.86, 284.80 and 81.62 is: 122.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.86 : 284.80 = 81.62 : x
  2. Step 2: Convert to fraction form
    189.86/284.80 = 81.62/x
  3. Step 3: Cross multiply
    189.86x = 284.80 × 81.62
  4. Step 4: Simplify right side
    189.86x = 23,243.75
  5. Step 5: Solve for x
    x = 23,243.75/189.86
  6. Step 6: Final answer
    x = 122.43

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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.