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Finding the Third Proportional to 620.72 and 903.09

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Solution

The third proportional to 620.72 and 903.09 is: 1,313.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.72 : 903.09 = 903.09 : x
  2. Step 2: Convert to fraction form
    620.72/903.09 = 903.09/x
  3. Step 3: Cross multiply
    620.72x = 903.09 × 903.09
  4. Step 4: Simplify right side
    620.72x = 815,578.32
  5. Step 5: Solve for x
    x = 815,578.32/620.72
  6. Step 6: Final answer
    x = 1,313.93

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.