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Finding the Fourth Proportional to 318.15, 439.04 and 178.28

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Solution

The fourth proportional to 318.15, 439.04 and 178.28 is: 246.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.15 : 439.04 = 178.28 : x
  2. Step 2: Convert to fraction form
    318.15/439.04 = 178.28/x
  3. Step 3: Cross multiply
    318.15x = 439.04 × 178.28
  4. Step 4: Simplify right side
    318.15x = 78,269.86
  5. Step 5: Solve for x
    x = 78,269.86/318.15
  6. Step 6: Final answer
    x = 246.02

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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.