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Finding the Fourth Proportional to 839.31, 1,258.97 and 254.31

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Solution

The fourth proportional to 839.31, 1,258.97 and 254.31 is: 381.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.31 : 1,258.97 = 254.31 : x
  2. Step 2: Convert to fraction form
    839.31/1,258.97 = 254.31/x
  3. Step 3: Cross multiply
    839.31x = 1,258.97 × 254.31
  4. Step 4: Simplify right side
    839.31x = 320,167.39
  5. Step 5: Solve for x
    x = 320,167.39/839.31
  6. Step 6: Final answer
    x = 381.47

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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.