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Finding the Fourth Proportional to 422.29, 632.98 and 285.30

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Solution

The fourth proportional to 422.29, 632.98 and 285.30 is: 427.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.29 : 632.98 = 285.30 : x
  2. Step 2: Convert to fraction form
    422.29/632.98 = 285.30/x
  3. Step 3: Cross multiply
    422.29x = 632.98 × 285.30
  4. Step 4: Simplify right side
    422.29x = 180,589.55
  5. Step 5: Solve for x
    x = 180,589.55/422.29
  6. Step 6: Final answer
    x = 427.64

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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.