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Finding the Third Proportional to 18,000 and 36,720

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Solution

The third proportional to 18,000 and 36,720 is: 74,908.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,000 : 36,720 = 36,720 : x
  2. Step 2: Convert to fraction form
    18,000/36,720 = 36,720/x
  3. Step 3: Cross multiply
    18,000x = 36,720 × 36,720
  4. Step 4: Simplify right side
    18,000x = 1,348,358,400
  5. Step 5: Solve for x
    x = 1,348,358,400/18,000
  6. Step 6: Final answer
    x = 74,908.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.