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Finding the Third Proportional to 78,120 and 115,722

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Solution

The third proportional to 78,120 and 115,722 is: 171,423.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,120 : 115,722 = 115,722 : x
  2. Step 2: Convert to fraction form
    78,120/115,722 = 115,722/x
  3. Step 3: Cross multiply
    78,120x = 115,722 × 115,722
  4. Step 4: Simplify right side
    78,120x = 13,391,581,284
  5. Step 5: Solve for x
    x = 13,391,581,284/78,120
  6. Step 6: Final answer
    x = 171,423.21

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.