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Finding the Third Proportional to 239.63 and 620.30

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Solution

The third proportional to 239.63 and 620.30 is: 1,605.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.63 : 620.30 = 620.30 : x
  2. Step 2: Convert to fraction form
    239.63/620.30 = 620.30/x
  3. Step 3: Cross multiply
    239.63x = 620.30 × 620.30
  4. Step 4: Simplify right side
    239.63x = 384,768.21
  5. Step 5: Solve for x
    x = 384,768.21/239.63
  6. Step 6: Final answer
    x = 1,605.71

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Why These Related Problems?

These problems maintain the same ratio (2.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.