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Finding the Fourth Proportional to 311.28, 429.57 and 171.40

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Solution

The fourth proportional to 311.28, 429.57 and 171.40 is: 236.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.28 : 429.57 = 171.40 : x
  2. Step 2: Convert to fraction form
    311.28/429.57 = 171.40/x
  3. Step 3: Cross multiply
    311.28x = 429.57 × 171.40
  4. Step 4: Simplify right side
    311.28x = 73,628.30
  5. Step 5: Solve for x
    x = 73,628.30/311.28
  6. Step 6: Final answer
    x = 236.53

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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.