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Finding the Third Proportional to 78,372 and 121,392

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Solution

The third proportional to 78,372 and 121,392 is: 188,026.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,372 : 121,392 = 121,392 : x
  2. Step 2: Convert to fraction form
    78,372/121,392 = 121,392/x
  3. Step 3: Cross multiply
    78,372x = 121,392 × 121,392
  4. Step 4: Simplify right side
    78,372x = 14,736,017,664
  5. Step 5: Solve for x
    x = 14,736,017,664/78,372
  6. Step 6: Final answer
    x = 188,026.56

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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.