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Finding the Fourth Proportional to 422.42, 633.42 and 172.16

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Solution

The fourth proportional to 422.42, 633.42 and 172.16 is: 258.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.42 : 633.42 = 172.16 : x
  2. Step 2: Convert to fraction form
    422.42/633.42 = 172.16/x
  3. Step 3: Cross multiply
    422.42x = 633.42 × 172.16
  4. Step 4: Simplify right side
    422.42x = 109,049.59
  5. Step 5: Solve for x
    x = 109,049.59/422.42
  6. Step 6: Final answer
    x = 258.15

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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.