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Finding the Third Proportional to 646.50 and 939.25

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Solution

The third proportional to 646.50 and 939.25 is: 1,364.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.50 : 939.25 = 939.25 : x
  2. Step 2: Convert to fraction form
    646.50/939.25 = 939.25/x
  3. Step 3: Cross multiply
    646.50x = 939.25 × 939.25
  4. Step 4: Simplify right side
    646.50x = 882,190.56
  5. Step 5: Solve for x
    x = 882,190.56/646.50
  6. Step 6: Final answer
    x = 1,364.56

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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.