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Finding the Third Proportional to 78,810 and 115,281

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Solution

The third proportional to 78,810 and 115,281 is: 168,629.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,810 : 115,281 = 115,281 : x
  2. Step 2: Convert to fraction form
    78,810/115,281 = 115,281/x
  3. Step 3: Cross multiply
    78,810x = 115,281 × 115,281
  4. Step 4: Simplify right side
    78,810x = 13,289,708,961
  5. Step 5: Solve for x
    x = 13,289,708,961/78,810
  6. Step 6: Final answer
    x = 168,629.73

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.