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Finding the Third Proportional to 121.25 and 212.50

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Solution

The third proportional to 121.25 and 212.50 is: 372.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.25 : 212.50 = 212.50 : x
  2. Step 2: Convert to fraction form
    121.25/212.50 = 212.50/x
  3. Step 3: Cross multiply
    121.25x = 212.50 × 212.50
  4. Step 4: Simplify right side
    121.25x = 45,156.25
  5. Step 5: Solve for x
    x = 45,156.25/121.25
  6. Step 6: Final answer
    x = 372.42

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Why These Related Problems?

These problems maintain the same ratio (1.75) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.