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Finding the Third Proportional to 18,720 and 28,080

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Solution

The third proportional to 18,720 and 28,080 is: 42,120

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720 : 28,080 = 28,080 : x
  2. Step 2: Convert to fraction form
    18,720/28,080 = 28,080/x
  3. Step 3: Cross multiply
    18,720x = 28,080 × 28,080
  4. Step 4: Simplify right side
    18,720x = 788,486,400
  5. Step 5: Solve for x
    x = 788,486,400/18,720
  6. Step 6: Final answer
    x = 42,120

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.