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Finding the Third Proportional to 170,400 and 257,987

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Solution

The third proportional to 170,400 and 257,987 is: 390,594.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,400 : 257,987 = 257,987 : x
  2. Step 2: Convert to fraction form
    170,400/257,987 = 257,987/x
  3. Step 3: Cross multiply
    170,400x = 257,987 × 257,987
  4. Step 4: Simplify right side
    170,400x = 66,557,292,169
  5. Step 5: Solve for x
    x = 66,557,292,169/170,400
  6. Step 6: Final answer
    x = 390,594.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.