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Finding the Third Proportional to 78,242 and 117,728

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Solution

The third proportional to 78,242 and 117,728 is: 177,141.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,242 : 117,728 = 117,728 : x
  2. Step 2: Convert to fraction form
    78,242/117,728 = 117,728/x
  3. Step 3: Cross multiply
    78,242x = 117,728 × 117,728
  4. Step 4: Simplify right side
    78,242x = 13,859,881,984
  5. Step 5: Solve for x
    x = 13,859,881,984/78,242
  6. Step 6: Final answer
    x = 177,141.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.