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Finding the Fourth Proportional to 311.28, 429.48 and 178.50

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Solution

The fourth proportional to 311.28, 429.48 and 178.50 is: 246.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.28 : 429.48 = 178.50 : x
  2. Step 2: Convert to fraction form
    311.28/429.48 = 178.50/x
  3. Step 3: Cross multiply
    311.28x = 429.48 × 178.50
  4. Step 4: Simplify right side
    311.28x = 76,662.18
  5. Step 5: Solve for x
    x = 76,662.18/311.28
  6. Step 6: Final answer
    x = 246.28

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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.