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Finding the Third Proportional to 255.50 and 320

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Solution

The third proportional to 255.50 and 320 is: 400.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.50 : 320 = 320 : x
  2. Step 2: Convert to fraction form
    255.50/320 = 320/x
  3. Step 3: Cross multiply
    255.50x = 320 × 320
  4. Step 4: Simplify right side
    255.50x = 102,400
  5. Step 5: Solve for x
    x = 102,400/255.50
  6. Step 6: Final answer
    x = 400.78

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These problems maintain the same ratio (1.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.