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Finding the Third Proportional to 216.50 and 354.75

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Solution

The third proportional to 216.50 and 354.75 is: 581.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.50 : 354.75 = 354.75 : x
  2. Step 2: Convert to fraction form
    216.50/354.75 = 354.75/x
  3. Step 3: Cross multiply
    216.50x = 354.75 × 354.75
  4. Step 4: Simplify right side
    216.50x = 125,847.56
  5. Step 5: Solve for x
    x = 125,847.56/216.50
  6. Step 6: Final answer
    x = 581.28

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.