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Finding the Fourth Proportional to 306.20, 422.47 and 175.21

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Solution

The fourth proportional to 306.20, 422.47 and 175.21 is: 241.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.20 : 422.47 = 175.21 : x
  2. Step 2: Convert to fraction form
    306.20/422.47 = 175.21/x
  3. Step 3: Cross multiply
    306.20x = 422.47 × 175.21
  4. Step 4: Simplify right side
    306.20x = 74,020.97
  5. Step 5: Solve for x
    x = 74,020.97/306.20
  6. Step 6: Final answer
    x = 241.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.