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Finding the Fourth Proportional to 311.37, 429.72 and 171.52

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Solution

The fourth proportional to 311.37, 429.72 and 171.52 is: 236.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.37 : 429.72 = 171.52 : x
  2. Step 2: Convert to fraction form
    311.37/429.72 = 171.52/x
  3. Step 3: Cross multiply
    311.37x = 429.72 × 171.52
  4. Step 4: Simplify right side
    311.37x = 73,702.57
  5. Step 5: Solve for x
    x = 73,702.57/311.37
  6. Step 6: Final answer
    x = 236.70

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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.