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Finding the Fourth Proportional to 309.40, 426.86 and 254.12

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Solution

The fourth proportional to 309.40, 426.86 and 254.12 is: 350.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.40 : 426.86 = 254.12 : x
  2. Step 2: Convert to fraction form
    309.40/426.86 = 254.12/x
  3. Step 3: Cross multiply
    309.40x = 426.86 × 254.12
  4. Step 4: Simplify right side
    309.40x = 108,472.39
  5. Step 5: Solve for x
    x = 108,472.39/309.40
  6. Step 6: Final answer
    x = 350.60

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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.