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Finding the Fourth Proportional to 318.28, 439.21 and 178.39

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Solution

The fourth proportional to 318.28, 439.21 and 178.39 is: 246.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.28 : 439.21 = 178.39 : x
  2. Step 2: Convert to fraction form
    318.28/439.21 = 178.39/x
  3. Step 3: Cross multiply
    318.28x = 439.21 × 178.39
  4. Step 4: Simplify right side
    318.28x = 78,350.67
  5. Step 5: Solve for x
    x = 78,350.67/318.28
  6. Step 6: Final answer
    x = 246.17

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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.