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Finding the Fourth Proportional to 422.26, 632.58 and 405.25

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Solution

The fourth proportional to 422.26, 632.58 and 405.25 is: 607.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.26 : 632.58 = 405.25 : x
  2. Step 2: Convert to fraction form
    422.26/632.58 = 405.25/x
  3. Step 3: Cross multiply
    422.26x = 632.58 × 405.25
  4. Step 4: Simplify right side
    422.26x = 256,353.05
  5. Step 5: Solve for x
    x = 256,353.05/422.26
  6. Step 6: Final answer
    x = 607.10

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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.