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Finding the Third Proportional to 386.25 and 528.75

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Solution

The third proportional to 386.25 and 528.75 is: 723.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.25 : 528.75 = 528.75 : x
  2. Step 2: Convert to fraction form
    386.25/528.75 = 528.75/x
  3. Step 3: Cross multiply
    386.25x = 528.75 × 528.75
  4. Step 4: Simplify right side
    386.25x = 279,576.56
  5. Step 5: Solve for x
    x = 279,576.56/386.25
  6. Step 6: Final answer
    x = 723.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.