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Finding the Third Proportional to 78,161.50 and 121,103.50

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Solution

The third proportional to 78,161.50 and 121,103.50 is: 187,637.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,161.50 : 121,103.50 = 121,103.50 : x
  2. Step 2: Convert to fraction form
    78,161.50/121,103.50 = 121,103.50/x
  3. Step 3: Cross multiply
    78,161.50x = 121,103.50 × 121,103.50
  4. Step 4: Simplify right side
    78,161.50x = 14,666,057,712.25
  5. Step 5: Solve for x
    x = 14,666,057,712.25/78,161.50
  6. Step 6: Final answer
    x = 187,637.87

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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.