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Finding the Third Proportional to 109.50 and 210.75

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Solution

The third proportional to 109.50 and 210.75 is: 405.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.50 : 210.75 = 210.75 : x
  2. Step 2: Convert to fraction form
    109.50/210.75 = 210.75/x
  3. Step 3: Cross multiply
    109.50x = 210.75 × 210.75
  4. Step 4: Simplify right side
    109.50x = 44,415.56
  5. Step 5: Solve for x
    x = 44,415.56/109.50
  6. Step 6: Final answer
    x = 405.62

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Why These Related Problems?

These problems maintain the same ratio (1.92) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.