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Finding the Fourth Proportional to 638.24, 957.16 and 422.96

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Solution

The fourth proportional to 638.24, 957.16 and 422.96 is: 634.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.24 : 957.16 = 422.96 : x
  2. Step 2: Convert to fraction form
    638.24/957.16 = 422.96/x
  3. Step 3: Cross multiply
    638.24x = 957.16 × 422.96
  4. Step 4: Simplify right side
    638.24x = 404,840.39
  5. Step 5: Solve for x
    x = 404,840.39/638.24
  6. Step 6: Final answer
    x = 634.31

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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.