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Finding the Third Proportional to 81,120 and 124,608

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Solution

The third proportional to 81,120 and 124,608 is: 191,409.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,120 : 124,608 = 124,608 : x
  2. Step 2: Convert to fraction form
    81,120/124,608 = 124,608/x
  3. Step 3: Cross multiply
    81,120x = 124,608 × 124,608
  4. Step 4: Simplify right side
    81,120x = 15,527,153,664
  5. Step 5: Solve for x
    x = 15,527,153,664/81,120
  6. Step 6: Final answer
    x = 191,409.69

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.