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Finding the Third Proportional to 78,394 and 121,422

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Solution

The third proportional to 78,394 and 121,422 is: 188,066.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,394 : 121,422 = 121,422 : x
  2. Step 2: Convert to fraction form
    78,394/121,422 = 121,422/x
  3. Step 3: Cross multiply
    78,394x = 121,422 × 121,422
  4. Step 4: Simplify right side
    78,394x = 14,743,302,084
  5. Step 5: Solve for x
    x = 14,743,302,084/78,394
  6. Step 6: Final answer
    x = 188,066.72

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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.