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Finding the Third Proportional to 78,396 and 121,425

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Solution

The third proportional to 78,396 and 121,425 is: 188,071.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,396 : 121,425 = 121,425 : x
  2. Step 2: Convert to fraction form
    78,396/121,425 = 121,425/x
  3. Step 3: Cross multiply
    78,396x = 121,425 × 121,425
  4. Step 4: Simplify right side
    78,396x = 14,744,030,625
  5. Step 5: Solve for x
    x = 14,744,030,625/78,396
  6. Step 6: Final answer
    x = 188,071.21

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.