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Finding the Third Proportional to 255.50 and 385

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Solution

The third proportional to 255.50 and 385 is: 580.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.50 : 385 = 385 : x
  2. Step 2: Convert to fraction form
    255.50/385 = 385/x
  3. Step 3: Cross multiply
    255.50x = 385 × 385
  4. Step 4: Simplify right side
    255.50x = 148,225
  5. Step 5: Solve for x
    x = 148,225/255.50
  6. Step 6: Final answer
    x = 580.14

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.