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Finding the Third Proportional to 129,739.50 and 165,780

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Solution

The third proportional to 129,739.50 and 165,780 is: 211,832.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,739.50 : 165,780 = 165,780 : x
  2. Step 2: Convert to fraction form
    129,739.50/165,780 = 165,780/x
  3. Step 3: Cross multiply
    129,739.50x = 165,780 × 165,780
  4. Step 4: Simplify right side
    129,739.50x = 27,483,008,400
  5. Step 5: Solve for x
    x = 27,483,008,400/129,739.50
  6. Step 6: Final answer
    x = 211,832.24

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.