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Finding the Third Proportional to 513.75 and 789.56

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Solution

The third proportional to 513.75 and 789.56 is: 1,213.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.75 : 789.56 = 789.56 : x
  2. Step 2: Convert to fraction form
    513.75/789.56 = 789.56/x
  3. Step 3: Cross multiply
    513.75x = 789.56 × 789.56
  4. Step 4: Simplify right side
    513.75x = 623,408.94
  5. Step 5: Solve for x
    x = 623,408.94/513.75
  6. Step 6: Final answer
    x = 1,213.45

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.