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Finding the Third Proportional to 172.13 and 358.31

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Solution

The third proportional to 172.13 and 358.31 is: 745.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.13 : 358.31 = 358.31 : x
  2. Step 2: Convert to fraction form
    172.13/358.31 = 358.31/x
  3. Step 3: Cross multiply
    172.13x = 358.31 × 358.31
  4. Step 4: Simplify right side
    172.13x = 128,387.85
  5. Step 5: Solve for x
    x = 128,387.85/172.13
  6. Step 6: Final answer
    x = 745.90

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.