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Finding the Third Proportional to 393.75 and 622.88

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Solution

The third proportional to 393.75 and 622.88 is: 985.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.75 : 622.88 = 622.88 : x
  2. Step 2: Convert to fraction form
    393.75/622.88 = 622.88/x
  3. Step 3: Cross multiply
    393.75x = 622.88 × 622.88
  4. Step 4: Simplify right side
    393.75x = 387,973.27
  5. Step 5: Solve for x
    x = 387,973.27/393.75
  6. Step 6: Final answer
    x = 985.33

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.