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Finding the Fourth Proportional to 422.43, 633.53 and 144.78

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Solution

The fourth proportional to 422.43, 633.53 and 144.78 is: 217.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.43 : 633.53 = 144.78 : x
  2. Step 2: Convert to fraction form
    422.43/633.53 = 144.78/x
  3. Step 3: Cross multiply
    422.43x = 633.53 × 144.78
  4. Step 4: Simplify right side
    422.43x = 91,718.58
  5. Step 5: Solve for x
    x = 91,718.58/422.43
  6. Step 6: Final answer
    x = 217.12

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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.