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Finding the Third Proportional to 311.50 and 407.75

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Solution

The third proportional to 311.50 and 407.75 is: 533.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.50 : 407.75 = 407.75 : x
  2. Step 2: Convert to fraction form
    311.50/407.75 = 407.75/x
  3. Step 3: Cross multiply
    311.50x = 407.75 × 407.75
  4. Step 4: Simplify right side
    311.50x = 166,260.06
  5. Step 5: Solve for x
    x = 166,260.06/311.50
  6. Step 6: Final answer
    x = 533.74

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.