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Finding the Third Proportional to 172,340 and 258,690

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Solution

The third proportional to 172,340 and 258,690 is: 388,305.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,340 : 258,690 = 258,690 : x
  2. Step 2: Convert to fraction form
    172,340/258,690 = 258,690/x
  3. Step 3: Cross multiply
    172,340x = 258,690 × 258,690
  4. Step 4: Simplify right side
    172,340x = 66,920,516,100
  5. Step 5: Solve for x
    x = 66,920,516,100/172,340
  6. Step 6: Final answer
    x = 388,305.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.