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Finding the Third Proportional to 55,781.25 and 78,021

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Solution

The third proportional to 55,781.25 and 78,021 is: 109,127.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,781.25 : 78,021 = 78,021 : x
  2. Step 2: Convert to fraction form
    55,781.25/78,021 = 78,021/x
  3. Step 3: Cross multiply
    55,781.25x = 78,021 × 78,021
  4. Step 4: Simplify right side
    55,781.25x = 6,087,276,441
  5. Step 5: Solve for x
    x = 6,087,276,441/55,781.25
  6. Step 6: Final answer
    x = 109,127.64

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.