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Finding the Fourth Proportional to 189.97, 284.99 and 132.21

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Solution

The fourth proportional to 189.97, 284.99 and 132.21 is: 198.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.97 : 284.99 = 132.21 : x
  2. Step 2: Convert to fraction form
    189.97/284.99 = 132.21/x
  3. Step 3: Cross multiply
    189.97x = 284.99 × 132.21
  4. Step 4: Simplify right side
    189.97x = 37,678.18
  5. Step 5: Solve for x
    x = 37,678.18/189.97
  6. Step 6: Final answer
    x = 198.34

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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.