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Finding the Third Proportional to 55,855 and 78,132

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Solution

The third proportional to 55,855 and 78,132 is: 109,293.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,855 : 78,132 = 78,132 : x
  2. Step 2: Convert to fraction form
    55,855/78,132 = 78,132/x
  3. Step 3: Cross multiply
    55,855x = 78,132 × 78,132
  4. Step 4: Simplify right side
    55,855x = 6,104,609,424
  5. Step 5: Solve for x
    x = 6,104,609,424/55,855
  6. Step 6: Final answer
    x = 109,293.88

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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.