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Finding the Third Proportional to 78,162 and 121,209

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Solution

The third proportional to 78,162 and 121,209 is: 187,963.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,162 : 121,209 = 121,209 : x
  2. Step 2: Convert to fraction form
    78,162/121,209 = 121,209/x
  3. Step 3: Cross multiply
    78,162x = 121,209 × 121,209
  4. Step 4: Simplify right side
    78,162x = 14,691,621,681
  5. Step 5: Solve for x
    x = 14,691,621,681/78,162
  6. Step 6: Final answer
    x = 187,963.74

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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.