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Finding the Fourth Proportional to 422.56, 632.82 and 387.93

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Solution

The fourth proportional to 422.56, 632.82 and 387.93 is: 580.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.56 : 632.82 = 387.93 : x
  2. Step 2: Convert to fraction form
    422.56/632.82 = 387.93/x
  3. Step 3: Cross multiply
    422.56x = 632.82 × 387.93
  4. Step 4: Simplify right side
    422.56x = 245,489.86
  5. Step 5: Solve for x
    x = 245,489.86/422.56
  6. Step 6: Final answer
    x = 580.97

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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.