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Finding the Fourth Proportional to 318.26, 439.14 and 248.20

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Solution

The fourth proportional to 318.26, 439.14 and 248.20 is: 342.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.26 : 439.14 = 248.20 : x
  2. Step 2: Convert to fraction form
    318.26/439.14 = 248.20/x
  3. Step 3: Cross multiply
    318.26x = 439.14 × 248.20
  4. Step 4: Simplify right side
    318.26x = 108,992.98
  5. Step 5: Solve for x
    x = 108,992.98/318.26
  6. Step 6: Final answer
    x = 342.46

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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.