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Finding the Third Proportional to 78,400 and 170,900

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Solution

The third proportional to 78,400 and 170,900 is: 372,535.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,400 : 170,900 = 170,900 : x
  2. Step 2: Convert to fraction form
    78,400/170,900 = 170,900/x
  3. Step 3: Cross multiply
    78,400x = 170,900 × 170,900
  4. Step 4: Simplify right side
    78,400x = 29,206,810,000
  5. Step 5: Solve for x
    x = 29,206,810,000/78,400
  6. Step 6: Final answer
    x = 372,535.84

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.