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Finding the Third Proportional to 221.50 and 317.75

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Solution

The third proportional to 221.50 and 317.75 is: 455.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.50 : 317.75 = 317.75 : x
  2. Step 2: Convert to fraction form
    221.50/317.75 = 317.75/x
  3. Step 3: Cross multiply
    221.50x = 317.75 × 317.75
  4. Step 4: Simplify right side
    221.50x = 100,965.06
  5. Step 5: Solve for x
    x = 100,965.06/221.50
  6. Step 6: Final answer
    x = 455.82

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.