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Finding the Third Proportional to 386.44 and 553.78

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Solution

The third proportional to 386.44 and 553.78 is: 793.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.44 : 553.78 = 553.78 : x
  2. Step 2: Convert to fraction form
    386.44/553.78 = 553.78/x
  3. Step 3: Cross multiply
    386.44x = 553.78 × 553.78
  4. Step 4: Simplify right side
    386.44x = 306,673.67
  5. Step 5: Solve for x
    x = 306,673.67/386.44
  6. Step 6: Final answer
    x = 793.59

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.