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Finding the Third Proportional to 163.69 and 399.09

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Solution

The third proportional to 163.69 and 399.09 is: 973.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.69 : 399.09 = 399.09 : x
  2. Step 2: Convert to fraction form
    163.69/399.09 = 399.09/x
  3. Step 3: Cross multiply
    163.69x = 399.09 × 399.09
  4. Step 4: Simplify right side
    163.69x = 159,275.82
  5. Step 5: Solve for x
    x = 159,275.82/163.69
  6. Step 6: Final answer
    x = 973.05

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Why These Related Problems?

These problems maintain the same ratio (2.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.