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Finding the Fourth Proportional to 309.38, 426.21 and 253.94

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Solution

The fourth proportional to 309.38, 426.21 and 253.94 is: 349.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.38 : 426.21 = 253.94 : x
  2. Step 2: Convert to fraction form
    309.38/426.21 = 253.94/x
  3. Step 3: Cross multiply
    309.38x = 426.21 × 253.94
  4. Step 4: Simplify right side
    309.38x = 108,231.77
  5. Step 5: Solve for x
    x = 108,231.77/309.38
  6. Step 6: Final answer
    x = 349.83

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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.