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Finding the Third Proportional to 33,980.50 and 51,720

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Solution

The third proportional to 33,980.50 and 51,720 is: 78,720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    33,980.50 : 51,720 = 51,720 : x
  2. Step 2: Convert to fraction form
    33,980.50/51,720 = 51,720/x
  3. Step 3: Cross multiply
    33,980.50x = 51,720 × 51,720
  4. Step 4: Simplify right side
    33,980.50x = 2,674,958,400
  5. Step 5: Solve for x
    x = 2,674,958,400/33,980.50
  6. Step 6: Final answer
    x = 78,720.40

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.