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Finding the Fourth Proportional to 318.50, 439.17 and 248.43

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Solution

The fourth proportional to 318.50, 439.17 and 248.43 is: 342.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.50 : 439.17 = 248.43 : x
  2. Step 2: Convert to fraction form
    318.50/439.17 = 248.43/x
  3. Step 3: Cross multiply
    318.50x = 439.17 × 248.43
  4. Step 4: Simplify right side
    318.50x = 109,103.00
  5. Step 5: Solve for x
    x = 109,103.00/318.50
  6. Step 6: Final answer
    x = 342.56

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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.