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Finding the Third Proportional to 393 and 513.75

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Solution

The third proportional to 393 and 513.75 is: 671.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    393 : 513.75 = 513.75 : x
  2. Step 2: Convert to fraction form
    393/513.75 = 513.75/x
  3. Step 3: Cross multiply
    393x = 513.75 × 513.75
  4. Step 4: Simplify right side
    393x = 263,939.06
  5. Step 5: Solve for x
    x = 263,939.06/393
  6. Step 6: Final answer
    x = 671.60

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.