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Finding the Fourth Proportional to 318.71, 439.81 and 178.81

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Solution

The fourth proportional to 318.71, 439.81 and 178.81 is: 246.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.71 : 439.81 = 178.81 : x
  2. Step 2: Convert to fraction form
    318.71/439.81 = 178.81/x
  3. Step 3: Cross multiply
    318.71x = 439.81 × 178.81
  4. Step 4: Simplify right side
    318.71x = 78,640.88
  5. Step 5: Solve for x
    x = 78,640.88/318.71
  6. Step 6: Final answer
    x = 246.75

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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.