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Finding the Third Proportional to 68.25 and 121.50

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Solution

The third proportional to 68.25 and 121.50 is: 216.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.25 : 121.50 = 121.50 : x
  2. Step 2: Convert to fraction form
    68.25/121.50 = 121.50/x
  3. Step 3: Cross multiply
    68.25x = 121.50 × 121.50
  4. Step 4: Simplify right side
    68.25x = 14,762.25
  5. Step 5: Solve for x
    x = 14,762.25/68.25
  6. Step 6: Final answer
    x = 216.30

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.