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Finding the Fourth Proportional to 638.80, 958.52 and 422.32

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Solution

The fourth proportional to 638.80, 958.52 and 422.32 is: 633.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.80 : 958.52 = 422.32 : x
  2. Step 2: Convert to fraction form
    638.80/958.52 = 422.32/x
  3. Step 3: Cross multiply
    638.80x = 958.52 × 422.32
  4. Step 4: Simplify right side
    638.80x = 404,802.17
  5. Step 5: Solve for x
    x = 404,802.17/638.80
  6. Step 6: Final answer
    x = 633.69

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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.