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Finding the Third Proportional to 307.50 and 399.25

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Solution

The third proportional to 307.50 and 399.25 is: 518.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.50 : 399.25 = 399.25 : x
  2. Step 2: Convert to fraction form
    307.50/399.25 = 399.25/x
  3. Step 3: Cross multiply
    307.50x = 399.25 × 399.25
  4. Step 4: Simplify right side
    307.50x = 159,400.56
  5. Step 5: Solve for x
    x = 159,400.56/307.50
  6. Step 6: Final answer
    x = 518.38

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.