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Finding the Fourth Proportional to 422.51, 633.69 and 133.88

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Solution

The fourth proportional to 422.51, 633.69 and 133.88 is: 200.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.51 : 633.69 = 133.88 : x
  2. Step 2: Convert to fraction form
    422.51/633.69 = 133.88/x
  3. Step 3: Cross multiply
    422.51x = 633.69 × 133.88
  4. Step 4: Simplify right side
    422.51x = 84,835.25
  5. Step 5: Solve for x
    x = 84,835.25/422.51
  6. Step 6: Final answer
    x = 200.79

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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.