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Finding the Fourth Proportional to 318.72, 439.84 and 248.86

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Solution

The fourth proportional to 318.72, 439.84 and 248.86 is: 343.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.72 : 439.84 = 248.86 : x
  2. Step 2: Convert to fraction form
    318.72/439.84 = 248.86/x
  3. Step 3: Cross multiply
    318.72x = 439.84 × 248.86
  4. Step 4: Simplify right side
    318.72x = 109,458.58
  5. Step 5: Solve for x
    x = 109,458.58/318.72
  6. Step 6: Final answer
    x = 343.43

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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.