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Finding the Third Proportional to 387.56 and 680.63

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Solution

The third proportional to 387.56 and 680.63 is: 1,195.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.56 : 680.63 = 680.63 : x
  2. Step 2: Convert to fraction form
    387.56/680.63 = 680.63/x
  3. Step 3: Cross multiply
    387.56x = 680.63 × 680.63
  4. Step 4: Simplify right side
    387.56x = 463,250.39
  5. Step 5: Solve for x
    x = 463,250.39/387.56
  6. Step 6: Final answer
    x = 1,195.29

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.