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Finding the Third Proportional to 18,720 and 28,400

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Solution

The third proportional to 18,720 and 28,400 is: 43,085.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720 : 28,400 = 28,400 : x
  2. Step 2: Convert to fraction form
    18,720/28,400 = 28,400/x
  3. Step 3: Cross multiply
    18,720x = 28,400 × 28,400
  4. Step 4: Simplify right side
    18,720x = 806,560,000
  5. Step 5: Solve for x
    x = 806,560,000/18,720
  6. Step 6: Final answer
    x = 43,085.47

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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.