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Finding the Third Proportional to 386.25 and 517.50

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Solution

The third proportional to 386.25 and 517.50 is: 693.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.25 : 517.50 = 517.50 : x
  2. Step 2: Convert to fraction form
    386.25/517.50 = 517.50/x
  3. Step 3: Cross multiply
    386.25x = 517.50 × 517.50
  4. Step 4: Simplify right side
    386.25x = 267,806.25
  5. Step 5: Solve for x
    x = 267,806.25/386.25
  6. Step 6: Final answer
    x = 693.35

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.