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Finding the Third Proportional to 118,909 and 257,420

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Solution

The third proportional to 118,909 and 257,420 is: 557,275.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,909 : 257,420 = 257,420 : x
  2. Step 2: Convert to fraction form
    118,909/257,420 = 257,420/x
  3. Step 3: Cross multiply
    118,909x = 257,420 × 257,420
  4. Step 4: Simplify right side
    118,909x = 66,265,056,400
  5. Step 5: Solve for x
    x = 66,265,056,400/118,909
  6. Step 6: Final answer
    x = 557,275.37

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.