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Finding the Third Proportional to 121.50 and 311.50

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Solution

The third proportional to 121.50 and 311.50 is: 798.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.50 : 311.50 = 311.50 : x
  2. Step 2: Convert to fraction form
    121.50/311.50 = 311.50/x
  3. Step 3: Cross multiply
    121.50x = 311.50 × 311.50
  4. Step 4: Simplify right side
    121.50x = 97,032.25
  5. Step 5: Solve for x
    x = 97,032.25/121.50
  6. Step 6: Final answer
    x = 798.62

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Why These Related Problems?

These problems maintain the same ratio (2.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.