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Finding the Third Proportional to 172,320 and 257,447

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Solution

The third proportional to 172,320 and 257,447 is: 384,627.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,320 : 257,447 = 257,447 : x
  2. Step 2: Convert to fraction form
    172,320/257,447 = 257,447/x
  3. Step 3: Cross multiply
    172,320x = 257,447 × 257,447
  4. Step 4: Simplify right side
    172,320x = 66,278,957,809
  5. Step 5: Solve for x
    x = 66,278,957,809/172,320
  6. Step 6: Final answer
    x = 384,627.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.