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Finding the Fourth Proportional to 306.39, 422.57 and 269.47

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Solution

The fourth proportional to 306.39, 422.57 and 269.47 is: 371.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.39 : 422.57 = 269.47 : x
  2. Step 2: Convert to fraction form
    306.39/422.57 = 269.47/x
  3. Step 3: Cross multiply
    306.39x = 422.57 × 269.47
  4. Step 4: Simplify right side
    306.39x = 113,869.94
  5. Step 5: Solve for x
    x = 113,869.94/306.39
  6. Step 6: Final answer
    x = 371.65

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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.